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 April 14 2026
05:49:49 AM | Tuesday April 14 2026
05:49:49 AMFlip Answers |
| 1) | 109 * 91 = | | 1) 100 * 100 - 9 * 9 = 9919 |
| 2) | 304 * 296 = | | 2) 300 * 300 - 4 * 4 = 89984 |
| 3) | 304 * 296 = | | 3) 300 * 300 - 4 * 4 = 89984 |
| 4) | 294 * 306 = | | 4) 300 * 300 - 6 * 6 = 89964 |
| 5) | 298 * 302 = | | 5) 300 * 300 - 2 * 2 = 89996 |
| 6) | 102 * 98 = | | 6) 100 * 100 - 2 * 2 = 9996 |
| 7) | 206 * 194 = | | 7) 200 * 200 - 6 * 6 = 39964 |
| 8) | 208 * 192 = | | 8) 200 * 200 - 8 * 8 = 39936 |
| 9) | 191 * 209 = | | 9) 200 * 200 - 9 * 9 = 39919 |
| 10) | 292 * 308 = | | 10) 300 * 300 - 8 * 8 = 89936 |
| 11) | 52 * 137 - 52 * 37 = | | 11) ( 137 - 37) * 52 = 5200 |
| 12) | 170 * 70 - 70 * 70 = | | 12) ( 170 - 70) * 70 = 7000 |
| 13) | 22 * 37 + 22 * 163 = | | 13) ( 163 + 37) * 22 = 4400 |
| 14) | 139 * 93 - 93 * 39 = | | 14) ( 139 - 39) * 93 = 9300 |
| 15) | 52 * 46 + 54 * 52 = | | 15) ( 46 + 54) * 52 = 5200 |
| 16) | 60 * 50 + 50 * 40 = | | 16) ( 60 + 40) * 50 = 5000 |
| 17) | 175 * 68 - 75 * 68 = | | 17) ( 175 - 75) * 68 = 6800 |
| 18) | 267 * 72 - 72 * 67 = | | 18) ( 267 - 67) * 72 = 14400 |
| 19) | 154 * 57 - 54 * 57 = | | 19) ( 154 - 54) * 57 = 5700 |
| 20) | 164 * 85 + 36 * 85 = | | 20) ( 164 + 36) * 85 = 17000 |
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Score: ______________ | |
