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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Tuesday March 31 2026
06:47:42 AM | Tuesday March 31 2026
06:47:42 AMFlip Answers |
| 1) | 108 * 92 = | | 1) 100 * 100 - 8 * 8 = 9936 |
| 2) | 408 * 392 = | | 2) 400 * 400 - 8 * 8 = 159936 |
| 3) | 309 * 291 = | | 3) 300 * 300 - 9 * 9 = 89919 |
| 4) | 198 * 202 = | | 4) 200 * 200 - 2 * 2 = 39996 |
| 5) | 102 * 98 = | | 5) 100 * 100 - 2 * 2 = 9996 |
| 6) | 95 * 105 = | | 6) 100 * 100 - 5 * 5 = 9975 |
| 7) | 193 * 207 = | | 7) 200 * 200 - 7 * 7 = 39951 |
| 8) | 399 * 401 = | | 8) 400 * 400 - 1 * 1 = 159999 |
| 9) | 196 * 204 = | | 9) 200 * 200 - 4 * 4 = 39984 |
| 10) | 207 * 193 = | | 10) 200 * 200 - 7 * 7 = 39951 |
| 11) | 153 * 53 + 53 * 47 = | | 11) ( 153 + 47) * 53 = 10600 |
| 12) | 260 * 96 - 96 * 60 = | | 12) ( 260 - 60) * 96 = 19200 |
| 13) | 41 * 158 - 58 * 41 = | | 13) ( 158 - 58) * 41 = 4100 |
| 14) | 154 * 87 - 87 * 54 = | | 14) ( 154 - 54) * 87 = 8700 |
| 15) | 26 * 46 + 54 * 26 = | | 15) ( 46 + 54) * 26 = 2600 |
| 16) | 161 * 34 + 39 * 34 = | | 16) ( 161 + 39) * 34 = 6800 |
| 17) | 35 * 142 + 35 * 58 = | | 17) ( 142 + 58) * 35 = 7000 |
| 18) | 255 * 24 - 55 * 24 = | | 18) ( 255 - 55) * 24 = 4800 |
| 19) | 78 * 48 + 78 * 52 = | | 19) ( 52 + 48) * 78 = 7800 |
| 20) | 62 * 74 + 74 * 138 = | | 20) ( 138 + 62) * 74 = 14800 |
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Score: ______________ | |
