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

      Dividing Numbers

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

      Adding Numbers

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

      Subtracting Numbers

  606. Subtracting from a repeating 1's number, dividing by 9, subtracting 21
  607. Subtracting from a repeating 8's number, dividing by 9, subtracting 10
  608. Subtracting the squares of two numbers
  609. Reversing/adding/subtracting 3-digit numbers

      Finding Percentages

  610. Finding 2.5 percent of a number
  611. Finding 5 percent of a number
  612. Finding 15 percent of a number
  613. Finding 20 percent of a number
  614. Finding 25 percent of a number
  615. Finding 33 1/3 percent of a number
  616. Finding 40 percent of a number
  617. Finding 45 percent of a number
  618. Finding 55 percent of a number
  619. Finding 70 percent of a number
  620. Finding 75 percent of a number

    Calculation Practice Exercises
     


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8 April 2008
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