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 August 06 2026
11:25:53 AM | Thursday August 06 2026
11:25:53 AMFlip Answers |
| 1) | 95 * 105 = | | 1) 100 * 100 - 5 * 5 = 9975 |
| 2) | 298 * 302 = | | 2) 300 * 300 - 2 * 2 = 89996 |
| 3) | 405 * 395 = | | 3) 400 * 400 - 5 * 5 = 159975 |
| 4) | 292 * 308 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 291 * 309 = | | 5) 300 * 300 - 9 * 9 = 89919 |
| 6) | 398 * 402 = | | 6) 400 * 400 - 2 * 2 = 159996 |
| 7) | 97 * 103 = | | 7) 100 * 100 - 3 * 3 = 9991 |
| 8) | 402 * 398 = | | 8) 400 * 400 - 2 * 2 = 159996 |
| 9) | 106 * 94 = | | 9) 100 * 100 - 6 * 6 = 9964 |
| 10) | 91 * 109 = | | 10) 100 * 100 - 9 * 9 = 9919 |
| 11) | 46 * 49 + 49 * 54 = | | 11) ( 54 + 46) * 49 = 4900 |
| 12) | 72 * 42 + 58 * 72 = | | 12) ( 58 + 42) * 72 = 7200 |
| 13) | 162 * 35 - 35 * 62 = | | 13) ( 162 - 62) * 35 = 3500 |
| 14) | 27 * 55 + 27 * 145 = | | 14) ( 145 + 55) * 27 = 5400 |
| 15) | 236 * 87 - 36 * 87 = | | 15) ( 236 - 36) * 87 = 17400 |
| 16) | 65 * 36 + 36 * 135 = | | 16) ( 135 + 65) * 36 = 7200 |
| 17) | 60 * 41 + 59 * 60 = | | 17) ( 41 + 59) * 60 = 6000 |
| 18) | 50 * 172 - 50 * 72 = | | 18) ( 172 - 72) * 50 = 5000 |
| 19) | 139 * 69 + 69 * 61 = | | 19) ( 139 + 61) * 69 = 13800 |
| 20) | 50 * 136 - 50 * 36 = | | 20) ( 136 - 36) * 50 = 5000 |
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Score: ______________ | |
