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 October 12 2026
05:56:42 PM | Monday October 12 2026
05:56:42 PMFlip Answers |
| 1) | 102 * 98 = | | 1) 100 * 100 - 2 * 2 = 9996 |
| 2) | 95 * 105 = | | 2) 100 * 100 - 5 * 5 = 9975 |
| 3) | 294 * 306 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 404 * 396 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 394 * 406 = | | 5) 400 * 400 - 6 * 6 = 159964 |
| 6) | 405 * 395 = | | 6) 400 * 400 - 5 * 5 = 159975 |
| 7) | 394 * 406 = | | 7) 400 * 400 - 6 * 6 = 159964 |
| 8) | 95 * 105 = | | 8) 100 * 100 - 5 * 5 = 9975 |
| 9) | 399 * 401 = | | 9) 400 * 400 - 1 * 1 = 159999 |
| 10) | 394 * 406 = | | 10) 400 * 400 - 6 * 6 = 159964 |
| 11) | 73 * 71 + 127 * 71 = | | 11) ( 127 + 73) * 71 = 14200 |
| 12) | 169 * 29 - 29 * 69 = | | 12) ( 169 - 69) * 29 = 2900 |
| 13) | 55 * 166 - 66 * 55 = | | 13) ( 166 - 66) * 55 = 5500 |
| 14) | 149 * 37 - 37 * 49 = | | 14) ( 149 - 49) * 37 = 3700 |
| 15) | 50 * 156 + 50 * 44 = | | 15) ( 156 + 44) * 50 = 10000 |
| 16) | 55 * 73 + 73 * 45 = | | 16) ( 55 + 45) * 73 = 7300 |
| 17) | 49 * 64 + 36 * 49 = | | 17) ( 36 + 64) * 49 = 4900 |
| 18) | 74 * 92 + 92 * 26 = | | 18) ( 26 + 74) * 92 = 9200 |
| 19) | 75 * 58 + 42 * 75 = | | 19) ( 42 + 58) * 75 = 7500 |
| 20) | 57 * 37 + 57 * 63 = | | 20) ( 37 + 63) * 57 = 5700 |
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Score: ______________ | |
