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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Thursday February 19 2026
07:31:18 PM | Thursday February 19 2026
07:31:18 PMFlip Answers |
| 1) | 199 * 201 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 106 * 94 = | | 2) 100 * 100 - 6 * 6 = 9964 |
| 3) | 97 * 103 = | | 3) 100 * 100 - 3 * 3 = 9991 |
| 4) | 105 * 95 = | | 4) 100 * 100 - 5 * 5 = 9975 |
| 5) | 396 * 404 = | | 5) 400 * 400 - 4 * 4 = 159984 |
| 6) | 92 * 108 = | | 6) 100 * 100 - 8 * 8 = 9936 |
| 7) | 399 * 401 = | | 7) 400 * 400 - 1 * 1 = 159999 |
| 8) | 305 * 295 = | | 8) 300 * 300 - 5 * 5 = 89975 |
| 9) | 392 * 408 = | | 9) 400 * 400 - 8 * 8 = 159936 |
| 10) | 295 * 305 = | | 10) 300 * 300 - 5 * 5 = 89975 |
| 11) | 143 * 89 - 89 * 43 = | | 11) ( 143 - 43) * 89 = 8900 |
| 12) | 256 * 27 - 56 * 27 = | | 12) ( 256 - 56) * 27 = 5400 |
| 13) | 262 * 60 - 60 * 62 = | | 13) ( 262 - 62) * 60 = 12000 |
| 14) | 258 * 72 - 58 * 72 = | | 14) ( 258 - 58) * 72 = 14400 |
| 15) | 71 * 56 + 56 * 129 = | | 15) ( 129 + 71) * 56 = 11200 |
| 16) | 44 * 87 + 87 * 56 = | | 16) ( 44 + 56) * 87 = 8700 |
| 17) | 60 * 144 - 44 * 60 = | | 17) ( 144 - 44) * 60 = 6000 |
| 18) | 25 * 261 - 25 * 61 = | | 18) ( 261 - 61) * 25 = 5000 |
| 19) | 59 * 55 + 41 * 55 = | | 19) ( 59 + 41) * 55 = 5500 |
| 20) | 36 * 29 + 64 * 29 = | | 20) ( 64 + 36) * 29 = 2900 |
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Score: ______________ | |
