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 April 23 2026
04:53:40 AM | Thursday April 23 2026
04:53:40 AMFlip Answers |
| 1) | 105 * 95 = | | 1) 100 * 100 - 5 * 5 = 9975 |
| 2) | 107 * 93 = | | 2) 100 * 100 - 7 * 7 = 9951 |
| 3) | 306 * 294 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 308 * 292 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 90 * 110 = | | 5) 100 * 100 - 10 * 10 = 9900 |
| 6) | 302 * 298 = | | 6) 300 * 300 - 2 * 2 = 89996 |
| 7) | 108 * 92 = | | 7) 100 * 100 - 8 * 8 = 9936 |
| 8) | 96 * 104 = | | 8) 100 * 100 - 4 * 4 = 9984 |
| 9) | 291 * 309 = | | 9) 300 * 300 - 9 * 9 = 89919 |
| 10) | 303 * 297 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 151 * 38 - 51 * 38 = | | 11) ( 151 - 51) * 38 = 3800 |
| 12) | 72 * 25 + 75 * 72 = | | 12) ( 25 + 75) * 72 = 7200 |
| 13) | 156 * 51 + 44 * 51 = | | 13) ( 156 + 44) * 51 = 10200 |
| 14) | 43 * 48 + 157 * 48 = | | 14) ( 157 + 43) * 48 = 9600 |
| 15) | 151 * 68 - 68 * 51 = | | 15) ( 151 - 51) * 68 = 6800 |
| 16) | 41 * 53 + 53 * 59 = | | 16) ( 59 + 41) * 53 = 5300 |
| 17) | 31 * 64 + 31 * 36 = | | 17) ( 64 + 36) * 31 = 3100 |
| 18) | 156 * 46 - 56 * 46 = | | 18) ( 156 - 56) * 46 = 4600 |
| 19) | 55 * 51 + 45 * 51 = | | 19) ( 55 + 45) * 51 = 5100 |
| 20) | 138 * 85 - 85 * 38 = | | 20) ( 138 - 38) * 85 = 8500 |
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Score: ______________ | |
