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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Friday July 31 2026
04:28:50 AM | Friday July 31 2026
04:28:50 AMFlip Answers |
| 1) | 93 * 107 = | | 1) 100 * 100 - 7 * 7 = 9951 |
| 2) | 402 * 398 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 207 * 193 = | | 3) 200 * 200 - 7 * 7 = 39951 |
| 4) | 296 * 304 = | | 4) 300 * 300 - 4 * 4 = 89984 |
| 5) | 303 * 297 = | | 5) 300 * 300 - 3 * 3 = 89991 |
| 6) | 110 * 90 = | | 6) 100 * 100 - 10 * 10 = 9900 |
| 7) | 102 * 98 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 202 * 198 = | | 8) 200 * 200 - 2 * 2 = 39996 |
| 9) | 408 * 392 = | | 9) 400 * 400 - 8 * 8 = 159936 |
| 10) | 395 * 405 = | | 10) 400 * 400 - 5 * 5 = 159975 |
| 11) | 64 * 143 - 43 * 64 = | | 11) ( 143 - 43) * 64 = 6400 |
| 12) | 22 * 136 - 22 * 36 = | | 12) ( 136 - 36) * 22 = 2200 |
| 13) | 96 * 243 - 96 * 43 = | | 13) ( 243 - 43) * 96 = 19200 |
| 14) | 90 * 74 + 126 * 90 = | | 14) ( 126 + 74) * 90 = 18000 |
| 15) | 44 * 43 + 57 * 44 = | | 15) ( 43 + 57) * 44 = 4400 |
| 16) | 67 * 77 + 77 * 133 = | | 16) ( 133 + 67) * 77 = 15400 |
| 17) | 47 * 245 - 47 * 45 = | | 17) ( 245 - 45) * 47 = 9400 |
| 18) | 84 * 137 - 84 * 37 = | | 18) ( 137 - 37) * 84 = 8400 |
| 19) | 255 * 83 - 55 * 83 = | | 19) ( 255 - 55) * 83 = 16600 |
| 20) | 245 * 33 - 33 * 45 = | | 20) ( 245 - 45) * 33 = 6600 |
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Score: ______________ | |
