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 April 12 2026
05:41:53 AM | Sunday April 12 2026
05:41:53 AMFlip Answers |
| 1) | 396 * 404 = | | 1) 400 * 400 - 4 * 4 = 159984 |
| 2) | 198 * 202 = | | 2) 200 * 200 - 2 * 2 = 39996 |
| 3) | 306 * 294 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 205 * 195 = | | 4) 200 * 200 - 5 * 5 = 39975 |
| 5) | 202 * 198 = | | 5) 200 * 200 - 2 * 2 = 39996 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 104 * 96 = | | 7) 100 * 100 - 4 * 4 = 9984 |
| 8) | 295 * 305 = | | 8) 300 * 300 - 5 * 5 = 89975 |
| 9) | 401 * 399 = | | 9) 400 * 400 - 1 * 1 = 159999 |
| 10) | 396 * 404 = | | 10) 400 * 400 - 4 * 4 = 159984 |
| 11) | 37 * 41 + 41 * 63 = | | 11) ( 63 + 37) * 41 = 4100 |
| 12) | 40 * 270 - 40 * 70 = | | 12) ( 270 - 70) * 40 = 8000 |
| 13) | 32 * 172 - 32 * 72 = | | 13) ( 172 - 72) * 32 = 3200 |
| 14) | 149 * 95 - 95 * 49 = | | 14) ( 149 - 49) * 95 = 9500 |
| 15) | 251 * 80 - 80 * 51 = | | 15) ( 251 - 51) * 80 = 16000 |
| 16) | 41 * 52 + 52 * 59 = | | 16) ( 41 + 59) * 52 = 5200 |
| 17) | 53 * 246 - 53 * 46 = | | 17) ( 246 - 46) * 53 = 10600 |
| 18) | 143 * 91 - 91 * 43 = | | 18) ( 143 - 43) * 91 = 9100 |
| 19) | 65 * 83 + 83 * 35 = | | 19) ( 35 + 65) * 83 = 8300 |
| 20) | 33 * 85 + 67 * 85 = | | 20) ( 33 + 67) * 85 = 8500 |
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Score: ______________ | |
