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 August 29 2026
08:24:07 AM | Saturday August 29 2026
08:24:07 AMFlip Answers |
| 1) | 209 * 191 = | | 1) 200 * 200 - 9 * 9 = 39919 |
| 2) | 302 * 298 = | | 2) 300 * 300 - 2 * 2 = 89996 |
| 3) | 206 * 194 = | | 3) 200 * 200 - 6 * 6 = 39964 |
| 4) | 195 * 205 = | | 4) 200 * 200 - 5 * 5 = 39975 |
| 5) | 292 * 308 = | | 5) 300 * 300 - 8 * 8 = 89936 |
| 6) | 92 * 108 = | | 6) 100 * 100 - 8 * 8 = 9936 |
| 7) | 92 * 108 = | | 7) 100 * 100 - 8 * 8 = 9936 |
| 8) | 204 * 196 = | | 8) 200 * 200 - 4 * 4 = 39984 |
| 9) | 102 * 98 = | | 9) 100 * 100 - 2 * 2 = 9996 |
| 10) | 196 * 204 = | | 10) 200 * 200 - 4 * 4 = 39984 |
| 11) | 154 * 24 - 24 * 54 = | | 11) ( 154 - 54) * 24 = 2400 |
| 12) | 44 * 47 + 56 * 47 = | | 12) ( 44 + 56) * 47 = 4700 |
| 13) | 238 * 89 - 38 * 89 = | | 13) ( 238 - 38) * 89 = 17800 |
| 14) | 266 * 69 - 69 * 66 = | | 14) ( 266 - 66) * 69 = 13800 |
| 15) | 76 * 146 + 76 * 54 = | | 15) ( 146 + 54) * 76 = 15200 |
| 16) | 269 * 25 - 25 * 69 = | | 16) ( 269 - 69) * 25 = 5000 |
| 17) | 44 * 29 + 29 * 156 = | | 17) ( 156 + 44) * 29 = 5800 |
| 18) | 75 * 246 - 46 * 75 = | | 18) ( 246 - 46) * 75 = 15000 |
| 19) | 130 * 32 + 70 * 32 = | | 19) ( 130 + 70) * 32 = 6400 |
| 20) | 28 * 45 + 72 * 45 = | | 20) ( 28 + 72) * 45 = 4500 |
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Score: ______________ | |
