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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Sunday March 22 2026
06:59:12 PM | Sunday March 22 2026
06:59:12 PMFlip Answers |
| 1) | 306 * 294 = | | 1) 300 * 300 - 6 * 6 = 89964 |
| 2) | 194 * 206 = | | 2) 200 * 200 - 6 * 6 = 39964 |
| 3) | 408 * 392 = | | 3) 400 * 400 - 8 * 8 = 159936 |
| 4) | 106 * 94 = | | 4) 100 * 100 - 6 * 6 = 9964 |
| 5) | 90 * 110 = | | 5) 100 * 100 - 10 * 10 = 9900 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 102 * 98 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 192 * 208 = | | 8) 200 * 200 - 8 * 8 = 39936 |
| 9) | 205 * 195 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 204 * 196 = | | 10) 200 * 200 - 4 * 4 = 39984 |
| 11) | 82 * 149 - 49 * 82 = | | 11) ( 149 - 49) * 82 = 8200 |
| 12) | 253 * 78 - 53 * 78 = | | 12) ( 253 - 53) * 78 = 15600 |
| 13) | 148 * 41 + 52 * 41 = | | 13) ( 148 + 52) * 41 = 8200 |
| 14) | 35 * 255 - 55 * 35 = | | 14) ( 255 - 55) * 35 = 7000 |
| 15) | 52 * 136 + 64 * 52 = | | 15) ( 136 + 64) * 52 = 10400 |
| 16) | 72 * 40 + 60 * 72 = | | 16) ( 40 + 60) * 72 = 7200 |
| 17) | 140 * 62 - 62 * 40 = | | 17) ( 140 - 40) * 62 = 6200 |
| 18) | 37 * 82 + 82 * 163 = | | 18) ( 163 + 37) * 82 = 16400 |
| 19) | 267 * 50 - 67 * 50 = | | 19) ( 267 - 67) * 50 = 10000 |
| 20) | 86 * 32 + 68 * 86 = | | 20) ( 32 + 68) * 86 = 8600 |
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Score: ______________ | |
