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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Wednesday June 24 2026
10:57:05 AM | Wednesday June 24 2026
10:57:05 AMFlip Answers |
| 1) | 306 * 294 = | | 1) 300 * 300 - 6 * 6 = 89964 |
| 2) | 297 * 303 = | | 2) 300 * 300 - 3 * 3 = 89991 |
| 3) | 292 * 308 = | | 3) 300 * 300 - 8 * 8 = 89936 |
| 4) | 109 * 91 = | | 4) 100 * 100 - 9 * 9 = 9919 |
| 5) | 99 * 101 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 210 * 190 = | | 6) 200 * 200 - 10 * 10 = 39900 |
| 7) | 398 * 402 = | | 7) 400 * 400 - 2 * 2 = 159996 |
| 8) | 398 * 402 = | | 8) 400 * 400 - 2 * 2 = 159996 |
| 9) | 109 * 91 = | | 9) 100 * 100 - 9 * 9 = 9919 |
| 10) | 303 * 297 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 89 * 172 - 72 * 89 = | | 11) ( 172 - 72) * 89 = 8900 |
| 12) | 83 * 252 - 83 * 52 = | | 12) ( 252 - 52) * 83 = 16600 |
| 13) | 75 * 76 + 25 * 76 = | | 13) ( 25 + 75) * 76 = 7600 |
| 14) | 83 * 143 - 83 * 43 = | | 14) ( 143 - 43) * 83 = 8300 |
| 15) | 27 * 64 + 27 * 36 = | | 15) ( 36 + 64) * 27 = 2700 |
| 16) | 70 * 63 + 37 * 70 = | | 16) ( 63 + 37) * 70 = 7000 |
| 17) | 78 * 267 - 78 * 67 = | | 17) ( 267 - 67) * 78 = 15600 |
| 18) | 74 * 26 + 126 * 26 = | | 18) ( 126 + 74) * 26 = 5200 |
| 19) | 239 * 54 - 54 * 39 = | | 19) ( 239 - 39) * 54 = 10800 |
| 20) | 21 * 258 - 21 * 58 = | | 20) ( 258 - 58) * 21 = 4200 |
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Score: ______________ | |
