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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Saturday February 14 2026
03:25:38 AM | Saturday February 14 2026
03:25:38 AMFlip Answers |
| 1) | 99 * 101 = | | 1) 100 * 100 - 1 * 1 = 9999 |
| 2) | 107 * 93 = | | 2) 100 * 100 - 7 * 7 = 9951 |
| 3) | 196 * 204 = | | 3) 200 * 200 - 4 * 4 = 39984 |
| 4) | 309 * 291 = | | 4) 300 * 300 - 9 * 9 = 89919 |
| 5) | 404 * 396 = | | 5) 400 * 400 - 4 * 4 = 159984 |
| 6) | 193 * 207 = | | 6) 200 * 200 - 7 * 7 = 39951 |
| 7) | 297 * 303 = | | 7) 300 * 300 - 3 * 3 = 89991 |
| 8) | 108 * 92 = | | 8) 100 * 100 - 8 * 8 = 9936 |
| 9) | 298 * 302 = | | 9) 300 * 300 - 2 * 2 = 89996 |
| 10) | 309 * 291 = | | 10) 300 * 300 - 9 * 9 = 89919 |
| 11) | 95 * 163 + 95 * 37 = | | 11) ( 163 + 37) * 95 = 19000 |
| 12) | 145 * 49 + 55 * 49 = | | 12) ( 145 + 55) * 49 = 9800 |
| 13) | 56 * 88 + 88 * 44 = | | 13) ( 56 + 44) * 88 = 8800 |
| 14) | 59 * 65 + 41 * 65 = | | 14) ( 59 + 41) * 65 = 6500 |
| 15) | 149 * 46 + 51 * 46 = | | 15) ( 149 + 51) * 46 = 9200 |
| 16) | 71 * 138 - 71 * 38 = | | 16) ( 138 - 38) * 71 = 7100 |
| 17) | 28 * 149 - 49 * 28 = | | 17) ( 149 - 49) * 28 = 2800 |
| 18) | 97 * 41 + 97 * 159 = | | 18) ( 159 + 41) * 97 = 19400 |
| 19) | 46 * 144 + 56 * 46 = | | 19) ( 144 + 56) * 46 = 9200 |
| 20) | 45 * 83 + 83 * 155 = | | 20) ( 155 + 45) * 83 = 16600 |
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Score: ______________ | |
