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BEATCALC: Beat the Calculator!

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Back to Math Tips & Tricks
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From the BEATCALC mailing list:
a weekly service from B. Lee Clay, archived here by the Math Forum.
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  Squaring Numbers

  1. Squaring a 2-digit number beginning with 1
  2. Squaring a 2-digit number beginning with 5
  3. Squaring a 2-digit number beginning with 9
  4. Squaring a 2-digit number ending in 1
  5. Squaring a 2-digit number ending in 2
  6. Squaring a 2-digit number ending in 3
  7. Squaring a 2-digit number ending in 4
  8. Squaring a 2-digit number ending in 5
  9. Squaring a 2-digit number ending in 6
  10. Squaring a 2-digit number ending in 7
  11. Squaring a 2-digit number ending in 8
  12. Squaring a 2-digit number ending in 9
  13. Squaring numbers made up of ones
  14. Squaring numbers made up of threes
  15. Squaring numbers made up of sixes
  16. Squaring numbers made up of nines
  17. Squaring numbers in the twenties
  18. Squaring numbers in the thirties
  19. Squaring numbers in the forties
  20. Squaring numbers in the fifties
  21. Squaring numbers in the sixties
  22. Squaring numbers in the seventies
  23. Squaring numbers in the eighties
  24. Squaring numbers in the hundreds
  25. Squaring numbers in the two hundreds
  26. Squaring numbers in the three hundreds
  27. Squaring numbers in the four hundreds
  28. Squaring numbers in the five hundreds
  29. Squaring numbers in the six hundreds
  30. Squaring numbers in the seven hundreds
  31. Squaring numbers between 800 and 810
  32. Squaring numbers in the nine hundreds
  33. Squaring numbers between 1000 and 1100
  34. Squaring numbers between 2000 and 2099
  35. Squaring numbers between 3000 and 3099
  36. Squaring numbers between 4000 and 4099
  37. Squaring numbers between 5000 and 5099
  38. Squaring numbers between 6000 and 6099
  39. Squaring numbers between 7000 and 7099
  40. Squaring special numbers (3's and final 1)
  41. Squaring special numbers (3's and final 2)
  42. Squaring special numbers (3's and final 4)
  43. Squaring special numbers (3's and final 5)
  44. Squaring special numbers (3's and final 6)
  45. Squaring special numbers (3's and final 7)
  46. Squaring special numbers (3's and final 8)
  47. Squaring special numbers (3's and final 9)
  48. Squaring special numbers (6's and final 1)
  49. Squaring special numbers (6's and final 2)
  50. Squaring special numbers (6's and final 3)
  51. Squaring special numbers (6's and final 4)
  52. Squaring special numbers (6's and final 5)
  53. Squaring special numbers (6's and final 7)
  54. Squaring special numbers (6's and final 8)
  55. Squaring special numbers (6's and final 9)
  56. Squaring special numbers (9's and final 1)
  57. Squaring special numbers (9's and final 2)
  58. Squaring special numbers (9's and final 3)
  59. Squaring special numbers (9's and final 4)
  60. Squaring special numbers (9's and final 5)
  61. Squaring special numbers (9's and final 6)
  62. Squaring special numbers (9's and final 7)
  63. Squaring special numbers (9's and final 8)
  64. Squaring special numbers (1 and repeating 3's)
  65. Squaring special numbers (1 and repeating 6's)
  66. Squaring special numbers (1 and repeating 9's)
  67. Squaring special numbers (2 and repeating 3's)
  68. Squaring special numbers (2 and repeating 6's)
  69. Squaring special numbers (2 and repeating 9's)
  70. Squaring special numbers (3 and repeating 6's)
  71. Squaring special numbers (3 and repeating 9's)
  72. Squaring special numbers (4 and repeating 3's)
  73. Squaring special numbers (4 and repeating 6's)
  74. Squaring special numbers (4 and repeating 9's)
  75. Squaring special numbers (5 and repeating 3's)
  76. Squaring special numbers (5 and repeating 6's)
  77. Squaring special numbers (5 and repeating 9's)
  78. Squaring special numbers (6 and repeating 3's)
  79. Squaring special numbers (6 and repeating 9's)
  80. Squaring special numbers (7 and repeating 3's)
  81. Squaring special numbers (7 and repeating 6's)
  82. Squaring special numbers (7 and repeating 9's)
  83. Squaring special numbers (8 and repeating 3's)
  84. Squaring special numbers (8 and repeating 9's)
  85. Squaring special numbers (9 and repeating 3's)
  86. Squaring special numbers (9 and repeating 6's)
  87. Squaring a repeating 6-digit number
  88. Squaring 2 rep. numbers, dividing by square of single digit

      Multiplying Numbers

  89. Multiplying two selected 2-digit numbers (same 1st digit) [1]
  90. Multiplying two selected 2-digit numbers (same 1st digit) [2]
  91. Multiplying two selected 2-digit numbers (same 2nd digit)
  92. Multiplying two selected 3-digit numbers (middle digit 0)
  93. Multiplying two selected 3-digit numbers (middle digit 1)
  94. Multiplying two selected 3-digit numbers (middle digit 2)
  95. Multiplying two selected 3-digit numbers (middle digit 3)
  96. Multiplying two selected 3-digit numbers (middle digit 4)
  97. Multiplying two selected 3-digit numbers (middle digit 5)
  98. Multiplying two 2-digit numbers with a difference of 1
  99. Multiplying two 2-digit numbers with a difference of 2
  100. Multiplying two 2-digit numbers with a difference of 3
  101. Multiplying two 2-digit numbers with a difference of 4
  102. Multiplying two 2-digit numbers with a difference of 6
  103. Multiplying two 2-digit numbers with a difference of 8
  104. Multiplying two 2-digit numbers with a difference of 10
  105. Multiplying a 2-digit number by 1 1/25
  106. Multiplying a 2-digit number by 1.1
  107. Multiplying a 2-digit number by 1 1/9
  108. Multiplying a 2-digit number by 1 1/8
  109. Multiplying a 2-digit number by 1 1/7
  110. Multiplying a 2-digit number by 1 1/6
  111. Multiplying a 2-digit number by 1 1/5
  112. Multiplying a 2-digit number by 1 2/9
  113. Multiplying a 2-digit number by 1 1/4
  114. Multiplying a 2-digit number by 1 2/7
  115. Multiplying a 2-digit number by 1.3
  116. Multiplying a 2-digit number by 1 1/3
  117. Multiplying a 2-digit number by 1 3/8
  118. Multiplying a 2-digit number by 1 2/5
  119. Multiplying a 2-digit number by 1 3/7
  120. Multiplying a 2-digit number by 1 1/2
  121. Multiplying a 2-digit number by 1 4/7
  122. Multiplying a 2-digit number by 1 3/5
  123. Multiplying a 2-digit number by 1.6
  124. Multiplying a 2- or 3-digit number by 1 2/3
  125. Multiplying a 2-digit number by 1 5/7
  126. Multiplying a 2-digit number by 1 3/4
  127. Multiplying a 2-digit number by 1 4/5
  128. Multiplying a 2-digit number by 1 5/6
  129. Multiplying a 2-digit number by 1 6/7
  130. Multiplying a 2-digit number by 1.9
  131. Multiplying a 2-digit number by 2.1
  132. Multiplying a 2-digit number by 2 1/9
  133. Multiplying a 2-digit number by 2 1/7
  134. Multiplying a 2-digit number by 2 1/5
  135. Multiplying a 2-digit number by 2 2/9
  136. Multiplying a 2-digit number by 2 1/4
  137. Multiplying a 2-digit number by 2.3
  138. Multiplying a 2-digit number by 2 1/3
  139. Multiplying a 2-digit number by 2 3/8
  140. Multiplying a 2-digit number by 2.4
  141. Multiplying a 2-digit number by 2 2/5
  142. Multiplying a 2-digit number by 2 4/9
  143. Multiplying a 2- or 3-digit number by 2 1/2
  144. Multiplying a 2-digit number by 2 4/7
  145. Multiplying a 2-digit number by 2.6
  146. Multiplying a 2-digit number by 2 5/8
  147. Multiplying a 2-digit number by 2 2/3
  148. Multiplying a 2-digit number by 2.7
  149. Multiplying a 2-digit number by 2 5/7
  150. Multiplying a 2-digit number by 2 3/4
  151. Multiplying a 2-digit number by 2 7/9
  152. Multiplying a 2-digit number by 2.8
  153. Multiplying a 2-digit number by 2 6/7
  154. Multiplying a 2-digit number by 2.9
  155. Multiplying a 2-digit number by 3.1
  156. Multiplying a 2-digit number by 3 1/8
  157. Multiplying a 2-digit number by 3 1/7
  158. Multiplying a 2-digit number by 3 1/6
  159. Multiplying a 2-digit number by 3.2
  160. Multiplying a 2-digit number by 3 2/9
  161. Multiplying a 2-digit number by 3 1/4
  162. Multiplying a 2-digit number by 3 1/3
  163. Multiplying a 2-digit number by 3.4
  164. Multiplying a 2-digit number by 3 3/7
  165. Multiplying a 2-digit number by 3 4/9
  166. Multiplying a 2-digit number by 3 1/2
  167. Multiplying a 2-digit number by 3.6
  168. Multiplying a 2-digit number by 3 4/7
  169. Multiplying a 2-digit number by 3 5/8
  170. Multiplying a 2-digit number by 3 2/3
  171. Multiplying a 2-digit number by 3.7
  172. Multiplying a 2-digit number by 3 5/7
  173. Multiplying a 2-digit number by 3 3/4
  174. Multiplying a 2-digit number by 3 4/5
  175. Multiplying a 2-digit number by 3 6/7
  176. Multiplying a 2-digit number by 3 7/8
  177. Multiplying a 2-digit number by 3.9
  178. Multiplying a 2-digit number by 4.1
  179. Multiplying a 2-digit number by 4 1/4
  180. Multiplying a 2-digit number by 4 1/7
  181. Multiplying a 2-digit number by 4 1/6
  182. Multiplying a 2-digit number by 4 1/5
  183. Multiplying a 2-digit number by 4 2/7
  184. Multiplying a 2-digit number by 4.3
  185. Multiplying a 2-digit number by 4.4
  186. Multiplying a 2-digit number by 4 3/7
  187. Multiplying a 2-digit number by 4 4/9
  188. Multiplying a 2-digit number by 4 1/2
  189. Multiplying a 2-digit number by 4 5/9
  190. Multiplying a 2-digit number by 4.6
  191. Multiplying a 2-digit number by 4.7
  192. Multiplying a 2-digit number by 4 3/4
  193. Multiplying a 2-digit number by 4 4/5
  194. Multiplying a 2-digit number by 4 5/6
  195. Multiplying a 2-digit number by 4 7/8
  196. Multiplying a 2-digit number by 5.1
  197. Multiplying a 2-digit number by 5 1/8
  198. Multiplying a 2-digit number by 5 1/6
  199. Multiplying a 2-digit number by 5.2
  200. Multiplying a 2-digit number by 5 1/4
  201. Multiplying a 2-digit number by 5.3
  202. Multiplying a 2-digit number by 5 4/9
  203. Multiplying a 2-digit number by 5 1/2
  204. Multiplying a 2-digit number by 5 5/9
  205. Multiplying a 2-digit number by 5.6
  206. Multiplying a 2-digit number by 5.7
  207. Multiplying a 2-digit number by 5 4/7
  208. Multiplying a 2-digit number by 5 5/7
  209. Multiplying a 2-digit number by 5 4/5
  210. Multiplying a 2-digit number by 5 6/7
  211. Multiplying a 2-digit number by 5.9
  212. Multiplying a 2-digit number by 6.1
  213. Multiplying a 2-digit number by 6 1/8
  214. Multiplying a 2-digit number by 6 1/5
  215. Multiplying a 2-digit number by 6 1/4
  216. Multiplying a 2-digit number by 6.3
  217. Multiplying a 2-digit number by 6 1/3
  218. Multiplying a 2-digit number by 6 3/8
  219. Multiplying a 2-digit number by 6.4
  220. Multiplying a 2-digit number by 6 4/9
  221. Multiplying a 2-digit number by 6 1/2
  222. Multiplying a 2-digit number by 6 5/9
  223. Multiplying a 2-digit number by 6.6
  224. Multiplying a 2-digit number by 6 2/3
  225. Multiplying a 2-digit number by 6 7/9
  226. Multiplying a 2-digit number by 6 5/6
  227. Multiplying a 2-digit number by 6 6/7
  228. Multiplying a 2-digit number by 6 8/9
  229. Multiplying a 2-digit number by 7.1
  230. Multiplying a 2-digit number by 7 1/7
  231. Multiplying a 2-digit number by 7.2
  232. Multiplying a 2-digit number by 7 1/4
  233. Multiplying a 2-digit number by 7.3
  234. Multiplying a 2-digit number by 7 2/7
  235. Multiplying a 2-digit number by 7.4
  236. Multiplying a 2-digit number by 7 1/2
  237. Multiplying a 2-digit number by 7 3/5
  238. Multiplying a 2-digit number by 7.6
  239. Multiplying a 2-digit number by 7.7
  240. Multiplying a 2-digit number by 7 3/4
  241. Multiplying a 2-digit number by 7 4/5
  242. Multiplying a 2-digit number by 8.1
  243. Multiplying a 2-digit number by 8 1/6
  244. Multiplying a 2-digit number by 8.2
  245. Multiplying a 2-digit number by 8 2/7
  246. Multiplying a 2-digit number by 8.3
  247. Multiplying a 2-digit number by 8 1/3
  248. Multiplying a 2-digit number by 8 3/7
  249. Multiplying a 2-digit number by 8 4/7
  250. Multiplying a 2-digit number by 8 1/2
  251. Multiplying a 2-digit number by 8.6
  252. Multiplying a 2-digit number by 8 5/8
  253. Multiplying a 2-digit number by 8 2/3
  254. Multiplying a 2-digit number by 8 5/7
  255. Multiplying a 2-digit number by 8 7/9
  256. Multiplying a 2-digit number by 8 7/8
  257. Multiplying a 2-digit number by 8 8/9
  258. Multiplying a 2-digit number by 9.1
  259. Multiplying a 2-digit number by 9.2
  260. Multiplying a 2-digit number by 9.3
  261. Multiplying a 2-digit number by 9 1/3
  262. Multiplying a 2-digit number by 9.4
  263. Multiplying a 2-digit number by 9 1/2 (four steps)
  264. Multiplying a 2-digit number by 9 1/2 (two steps)
  265. Multiplying a 2-digit number by 9.6
  266. Multiplying a 2-digit number by 9 2/3
  267. Multiplying a 2-digit number by 9 5/7
  268. Multiplying a 2-digit number by 9.7
  269. Multiplying a 2-digit number by 9 3/4
  270. Multiplying a 2-digit number by 9 7/9
  271. Multiplying a 2-digit number by 9 4/5
  272. Multiplying a 2-digit number by 9 5/6
  273. Multiplying a 2-digit number by 9 6/7
  274. Multiplying a 2-digit number by 9 7/8
  275. Multiplying a 2-digit number by 9 8/9
  276. Multiplying a 2-digit number by 10.1
  277. Multiplying a 2-digit number by 10.4
  278. Multiplying a 2-digit number by 10.7
  279. Multiplying a 2-digit number by 10 1/2
  280. Multiplying a 2-digit number by 11 1/2
  281. Multiplying a 2-digit number by 12 1/2
  282. Multiplying a 2-digit number by 15
  283. Multiplying a 2- or 3-digit number by 16 2/3
  284. Multiplying a 2-digit number by 18
  285. Multiplying a 2-digit number by 19 1/2
  286. Multiplying a 2-digit number by 20 1/2
  287. Multiplying a 2-digit number by 21
  288. Multiplying a 2-digit number by 22
  289. Multiplying a 2-digit number by 23
  290. Multiplying a 2-digit number by 24
  291. Multiplying a 2- or 3-digit number by 25
  292. Multiplying a 2-digit number by 26
  293. Multiplying a 2-digit number by 27
  294. Multiplying a 2-digit number by 28
  295. Multiplying a 2-digit number by 29
  296. Multiplying a 2-digit number by 29 ½
  297. Multiplying a 2-digit number by 30 ½
  298. Multiplying a 2-digit number by 31
  299. Multiplying a 2-digit number by 32
  300. Multiplying a 2-digit number by 33
  301. Multiplying a 2-digit number by 33 1/3
  302. Multiplying a 2-digit number by 34
  303. Multiplying a 2-digit number by 35
  304. Multiplying a 2-digit number by 36
  305. Multiplying a 2-digit number by 37
  306. Multiplying a 2-digit number by 37 1/2
  307. Multiplying a 2-digit number by 38
  308. Multiplying a 2-digit number by 39
  309. Multiplying a 2-digit number by 39 1/2
  310. Multiplying a 2-digit number by 40 1/2
  311. Multiplying a 2-digit number by 42
  312. Multiplying a 2-digit number by 43
  313. Multiplying a 2-digit number by 44
  314. Multiplying a 2-digit number by 45
  315. Multiplying a 2-digit number by 46
  316. Multiplying a 2-digit number by 47
  317. Multiplying a 2-digit number by 48
  318. Multiplying a 2-digit number by 49 (a)
  319. Multiplying a 2-digit number by 49 (b)
  320. Multiplying a 2-digit number by 49 1/2
  321. Multiplying a 2-digit number by 50 1/2
  322. Multiplying a 2-digit number by 51
  323. Multiplying a 2-digit number by 52
  324. Multiplying a 2-digit number by 53
  325. Multiplying a 2-digit number by 54
  326. Multiplying a 2-digit number by 55 (a)
  327. Multiplying a 2-digit number by 55 (b)
  328. Multiplying a 2-digit number by 56
  329. Multiplying a 2-digit number by 57
  330. Multiplying a 2-digit number by 58
  331. Multiplying a 2-digit number by 59
  332. Multiplying a 2-digit number by 59 1/2
  333. Multiplying a 2-digit number by 60 1/2
  334. Multiplying a 2-digit number by 61
  335. Multiplying a 2-digit number by 62
  336. Multiplying a 2-digit number by 63
  337. Multiplying a 2-digit number by 64
  338. Multiplying a 2-digit number by 65
  339. Multiplying a 2-digit number by 66
  340. Multiplying a 2-digit number by 67
  341. Multiplying a 2-digit number by 68
  342. Multiplying a 2-digit number by 69
  343. Multiplying a 2-digit number by 69 1/2
  344. Multiplying a 2-digit number by 70 1/2
  345. Multiplying a 2-digit number by 71
  346. Multiplying a 2-digit number by 72
  347. Multiplying a 2-digit number by 73
  348. Multiplying a 2- or 3-digit number by 75
  349. Multiplying a 2-digit number by 76
  350. Multiplying a 2-digit number by 77
  351. Multiplying a 2-digit number by 78
  352. Multiplying a 2-digit number by 79
  353. Multiplying a 2-digit number by 79 1/2
  354. Multiplying a 2-digit number by 80 1/2
  355. Multiplying a 2-digit number by 81
  356. Multiplying a 2-digit number by 82
  357. Multiplying a 2-digit number by 83
  358. Multiplying a 2-digit number by 84
  359. Multiplying a 2-digit number by 85
  360. Multiplying a 2-digit number by 86
  361. Multiplying a 2-digit number by 87
  362. Multiplying a 2-digit number by 88
  363. Multiplying a 2-digit number by 89
  364. Multiplying a 2-digit number by 89 1/2
  365. Multiplying a 2-digit number by 90 1/2
  366. Multiplying a 2-digit number by 91
  367. Multiplying a 2-digit number by 92
  368. Multiplying a 2-digit number by 93
  369. Multiplying a 2-digit number by 94
  370. Multiplying a 2-digit number by 97
  371. Multiplying a 2-digit number by 99
  372. Multiplying a 3-digit number by 99
  373. Multiplying a 2- or 3-digit number by 101
  374. Multiplying a 2-digit number by 102 and adding 11
  375. Multiplying a 2-digit number by 103 and adding 12
  376. Multiplying a 2-digit number by 125
  377. Multiplying a 3-digit number by 143
  378. Multiplying a 2-digit number by 166 2/3
  379. Multiplying a 2-digit number by 198
  380. Multiplying a 2-digit number by 201 and adding 11
  381. Multiplying a 2-digit number by 202 and adding 11
  382. Multiplying a 2-digit number by 250
  383. Multiplying a 2-digit number by 297
  384. Multiplying a 2-digit number by 375
  385. Multiplying a 2-digit number by 396
  386. Multiplying a 2-digit number by 495
  387. Multiplying a 2-digit number by 594
  388. Multiplying a 2-digit number by 625
  389. Multiplying a 2-digit number by 693
  390. Multiplying a 2-digit number by 792
  391. Multiplying a 2-digit number by 875
  392. Multiplying a 2-digit number by 891
  393. Multiplying a 2-digit number by 999
  394. Multiplying a 2- or 3-digit number by 1001 and adding 21 (or 201)
  395. Multiplying a 2-, 3-, or 4-digit number by 10001 and adding 21, 201, or 2001
  396. Multiplying a 2-, 3-, 4-, or 5-digit number by 100001
  397. Multiplying repeating 1's by repeating 9's
  398. Multiplying repeating 1's by 12
  399. Multiplying repeating 1's by 13
  400. Multiplying repeating 1's by 14
  401. Multiplying repeating 1's by 15
  402. Multiplying repeating 1's by 16
  403. Multiplying repeating 1's by 17
  404. Multiplying repeating 1's by 18
  405. Multiplying repeating 1's by 19
  406. Multiplying repeating 1's by 21
  407. Multiplying repeating 1's by 22
  408. Multiplying repeating 1's by 24
  409. Multiplying repeating 1's by 25
  410. Multiplying repeating 1's by 26
  411. Multiplying repeating 1's by 27
  412. Multiplying repeating 1's by 29
  413. Multiplying repeating 1's by 33
  414. Multiplying repeating 1's by 41
  415. Multiplying repeating 1's by 44
  416. Multiplying repeating 1's by 45
  417. Multiplying repeating 1's by 55
  418. Multiplying repeating 1's by 66
  419. Multiplying repeating 1's by 77
  420. Multiplying repeating 1's by 88
  421. Multiplying repeating 1's by 99
  422. Multiplying repeating 1's by 222
  423. Multiplying repeating 1's by 333
  424. Multiplying repeating 2's by repeating 5's
  425. Multiplying repeating 2's by repeating 9's
  426. Multiplying repeating 2's by 12
  427. Multiplying repeating 2's by 13
  428. Multiplying repeating 2's by 15
  429. Multiplying repeating 2's by 16
  430. Multiplying repeating 2's by 17
  431. Multiplying repeating 2's by 22
  432. Multiplying repeating 2's by 24
  433. Multiplying repeating 2's by 28
  434. Multiplying repeating 2's by 33
  435. Multiplying repeating 2's by 44
  436. Multiplying repeating 2's by 55
  437. Multiplying repeating 2's by 66
  438. Multiplying repeating 2's by 77
  439. Multiplying repeating 2's by 88
  440. Multiplying repeating 2's by 99
  441. Multiplying repeating 3's by repeating 6's
  442. Multiplying repeating 3's by repeating 9's
  443. Multiplying repeating 3's by 13
  444. Multiplying repeating 3's by 15
  445. Multiplying repeating 3's by 23
  446. Multiplying repeating 3's by 35
  447. Multiplying repeating 3's by 55
  448. Multiplying repeating 3's by 66
  449. Multiplying repeating 3's by 77
  450. Multiplying repeating 3's by 88
  451. Multiplying repeating 3's by 99
  452. Multiplying repeating 4's by 15
  453. Multiplying repeating 4's by 17
  454. Multiplying repeating 4's by 22
  455. Multiplying repeating 4's by 24
  456. Multiplying repeating 4's by 28
  457. Multiplying repeating 4's by 31
  458. Multiplying repeating 4's by 36
  459. Multiplying repeating 4's by 42
  460. Multiplying repeating 4's by 44
  461. Multiplying repeating 4's by 55
  462. Multiplying repeating 4's by 88
  463. Multiplying repeating 4's by repeating 3's
  464. Multiplying repeating 4's by repeating 5's
  465. Multiplying repeating 4's by repeating 9's
  466. Multiplying repeating 5's by 25
  467. Multiplying repeating 5's by 28
  468. Multiplying repeating 5's by 33
  469. Multiplying repeating 5's by 45
  470. Multiplying repeating 5's by 55
  471. Multiplying repeating 5's by 66
  472. Multiplying repeating 5's by 88
  473. Multiplying repeating 5's by repeating 9's
  474. Multiplying repeating 6's by repeating 9's
  475. Multiplying repeating 6's by 16
  476. Multiplying repeating 6's by 12
  477. Multiplying repeating 6's by 22
  478. Multiplying repeating 6's by 31
  479. Multiplying repeating 6's by 32
  480. Multiplying repeating 6's by 33
  481. Multiplying repeating 6's by 43
  482. Multiplying repeating 6's by 66
  483. Multiplying repeating 6's by 77
  484. Multiplying repeating 6's by 88
  485. Multiplying repeating 6's by 444
  486. Multiplying repeating 6's by 888
  487. Multiplying repeating 7's by repeating 9's
  488. Multiplying repeating 7's by 17
  489. Multiplying repeating 7's by 32
  490. Multiplying repeating 7's by 33
  491. Multiplying repeating 7's by 42
  492. Multiplying repeating 7's by 44
  493. Multiplying repeating 7's by 55
  494. Multiplying repeating 7's by 88
  495. Multiplying repeating 8's by repeating 9's
  496. Multiplying repeating 8's by 22
  497. Multiplying repeating 8's by 23
  498. Multiplying repeating 8's by 29
  499. Multiplying repeating 8's by 36
  500. Multiplying repeating 8's by 44
  501. Multiplying repeating 8's by 55
  502. Multiplying repeating 8's by 66
  503. Multiplying repeating 8's by 88
  504. Multiplying repeating 9's by 14
  505. Multiplying repeating 9's by 22
  506. Multiplying repeating 9's by 25
  507. Multiplying repeating 9's by 27
  508. Multiplying repeating 9's by 33
  509. Multiplying repeating 9's by 44
  510. Multiplying repeating 9's by 55
  511. Multiplying repeating 9's by 77
  512. Multiplying repeating 9's by 99
  513. Multiplying a repeating 3-digit number by 2, then dividing it by 37
  514. Multiplying a repeating 3-digit number by 5, then dividing it by 37
  515. Multiplying a repeating 9-digit number by 3, then dividing it by 12345679
  516. Multiplying a multi-digit number by 8 and adding the last digit
  517. Multiplying a number sequence by 8, adding a number, and subtracting 20
  518. Multiply integer + 1/2 times the number +1
  519. Multiplying the sum and the difference of a 2-digit and a 1-digit number
  520. Multiplying two mixed numbers
  521. Multiplying two mixed numbers with fractions adding to 1
  522. Multiplying a 4-digit number by 99
  523. Multiplying a 4-digit number by 137 and 73; subtracting 1200
  524. Multiplying a 5-digit number by 9091 and 11; subtracting 1200

      Dividing Numbers

  525. Dividing a number by 0.125
  526. Dividing a 2-digit number by 1 1/9
  527. Dividing a 2-digit number by 1 1/8
  528. Dividing a 2-digit number by 1 1/7
  529. Dividing a 2-digit number by 1 1/6
  530. Dividing a 2-digit number by 1 1/5
  531. Dividing a 2-digit number by 1 1/4
  532. Dividing a 2-digit number by 1 2/7
  533. Dividing a 2-digit number by 1 1/3
  534. Dividing a 2-digit number by 1 2/5
  535. Dividing a 2-digit number by 1 3/7
  536. Dividing a 2-digit number by 1 1/2
  537. Dividing a 2-digit number by 1 3/5
  538. Dividing a 2-digit number by 1 2/3
  539. Dividing a 2-digit number by 1 3/4
  540. Dividing a 2-digit number by 1 4/5
  541. Dividing a 2-digit number by 2 2/9
  542. Dividing a 2-digit number by 2 1/4
  543. Dividing a 2-digit number by 2 1/3
  544. Dividing a 2- or 3-digit number by 2 1/2
  545. Dividing a 2-digit number by 2 2/3
  546. Dividing a 2-digit number by 2 6/7
  547. Dividing a 2-digit number by 3 1/8
  548. Dividing a 2- or 3-digit number by 3 1/3
  549. Dividing a 2-digit number by 3 1/2
  550. Dividing a 2-digit number by 3 4/7
  551. Dividing a 2-digit number by 4 1/6
  552. Dividing a 2-digit number by 4 2/7
  553. Dividing a 2-digit number by 4 4/9
  554. Dividing a 2-digit number by 4 1/2
  555. Dividing a 2-digit number by 5 5/7
  556. Dividing a 2-digit number by 6 1/4
  557. Dividing a 2-digit number by 6 2/3
  558. Dividing a 2-digit number by 7 1/7
  559. Dividing a 2-digit number by 7 2/7
  560. Dividing a 2-digit number by 7 1/2
  561. Dividing a 2-digit number by 8 1/3
  562. Dividing a 2-digit number by 8 4/7
  563. Dividing a 2-digit number by 12 1/2
  564. Dividing a 2-digit number by 15
  565. Dividing a 2- or 3-digit number by 16 2/3
  566. Dividing a 2- or 3-digit number by 25
  567. Dividing a 2- or 3-digit number by 33 1/3
  568. Dividing a 2- or 3-digit number by 35
  569. Dividing a 2-digit number by 37 1/2
  570. Dividing a 2-digit number by 40
  571. Dividing a 2-digit number by 45
  572. Dividing a 2-digit number by 50
  573. Dividing a 2-digit number by 62 1/2
  574. Dividing a 2- or 3-digit number by 66 2/3
  575. Dividing a 2- or 3-digit number by 75
  576. Dividing a 2-digit number by 83 1/3
  577. Dividing a 2-digit number by 87 1/2
  578. Dividing a 2-digit number by 125
  579. Dividing a 2-digit number by 166 2/3
  580. Dividing a 2-digit number by 250
  581. Dividing a 2- or 3-digit number by 333 1/3
  582. Dividing a 2-digit number by 375
  583. Dividing a 2-digit number by 625
  584. Dividing a 2-digit number by 875
  585. Dividing a repeating 3-digit number by 37 and adding 41
  586. Dividing a repeating 6-digit number by 15873
  587. Dividing a repeating 6-digit number by 7, then by 13
  588. Dividing a repeating 6-digit number by 13, then by 11
  589. Dividing a repeating 6-digit number by 7, 11, and 13, then subtracting 101
  590. Dividing a repeating 6-digit number by 37037, then multiplying by 5
  591. Dividing mixed numbers by 2
  592. Finding the difference of the squares of two consecutive 2-digit numbers
  593. Finding the difference of the squares of two different 2-digit numbers
  594. Finding the square root of squares of 2-digit numbers ending in 1
  595. Finding the square root of a perfect square ending in 5

      Adding Numbers

  596. Finding the sum of all even numbers from 2 through a selected 2-digit even number
  597. Finding the sum of the digits of the square of repeating ones
  598. Adding a sequence of consecutive odd numbers
  599. Adding consecutive numbers between two numbers
  600. Adding a sequence of numbers from one to a selected 2-digit number
  601. Adding a sequence of numbers from one to a selected 1-digit number and back
  602. Adding sequences of numbers in the 10's
  603. Adding sequences of numbers in the 20's
  604. Adding sequences of numbers in the 30's
  605. Adding sequences of numbers in the 40's
  606. Adding sequences of numbers in the 50's
  607. Adding sequences of numbers in the 60's
  608. Adding sequences of numbers in the 70's
  609. Adding sequences of numbers in the 80's
  610. Adding a series of doubles
  611. Adding a series of quadruples
  612. Adding a series of ten numbers

      Subtracting Numbers

  613. Subtracting from a repeating 1's number, dividing by 9, subtracting 21
  614. Subtracting from a repeating 8's number, dividing by 9, subtracting 10
  615. Subtracting the squares of two numbers
  616. Reversing/adding/subtracting 3-digit numbers

      Finding Percentages

  617. Finding 2.5 percent of a number
  618. Finding 5 percent of a number
  619. Finding 15 percent of a number
  620. Finding 20 percent of a number
  621. Finding 25 percent of a number
  622. Finding 33 1/3 percent of a number
  623. Finding 40 percent of a number
  624. Finding 45 percent of a number
  625. Finding 55 percent of a number
  626. Finding 70 percent of a number
  627. Finding 75 percent of a number

    Calculation Practice Exercises
     


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8 April 2008
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