Math Main Page => Exercises - Math III
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Goal: to practice how to make use of distributive property on special numbers, like (A + B) * (A - B) = A*A - B*B, A*C +B*C = (A + B ) *C, A*C - B*C = (A-B) * C
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Monday March 16 2026
07:38:16 PM | Monday March 16 2026
07:38:16 PMFlip Answers |
| 1) | 106 * 94 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 402 * 398 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 299 * 301 = | | 3) 300 * 300 - 1 * 1 = 89999 |
| 4) | 403 * 397 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 191 * 209 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 190 * 210 = | | 6) 200 * 200 - 10 * 10 = 39900 |
| 7) | 90 * 110 = | | 7) 100 * 100 - 10 * 10 = 9900 |
| 8) | 91 * 109 = | | 8) 100 * 100 - 9 * 9 = 9919 |
| 9) | 401 * 399 = | | 9) 400 * 400 - 1 * 1 = 159999 |
| 10) | 395 * 405 = | | 10) 400 * 400 - 5 * 5 = 159975 |
| 11) | 48 * 52 + 48 * 48 = | | 11) ( 48 + 52) * 48 = 4800 |
| 12) | 84 * 151 - 84 * 51 = | | 12) ( 151 - 51) * 84 = 8400 |
| 13) | 44 * 63 + 56 * 63 = | | 13) ( 56 + 44) * 63 = 6300 |
| 14) | 170 * 29 - 70 * 29 = | | 14) ( 170 - 70) * 29 = 2900 |
| 15) | 251 * 85 - 51 * 85 = | | 15) ( 251 - 51) * 85 = 17000 |
| 16) | 85 * 64 + 85 * 36 = | | 16) ( 36 + 64) * 85 = 8500 |
| 17) | 61 * 79 + 39 * 79 = | | 17) ( 39 + 61) * 79 = 7900 |
| 18) | 240 * 26 - 40 * 26 = | | 18) ( 240 - 40) * 26 = 5200 |
| 19) | 63 * 66 + 63 * 34 = | | 19) ( 34 + 66) * 63 = 6300 |
| 20) | 47 * 252 - 47 * 52 = | | 20) ( 252 - 52) * 47 = 9400 |
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Score: ______________ | |
