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 21 2026
04:48:34 AM | Tuesday April 21 2026
04:48:34 AMFlip Answers |
| 1) | 93 * 107 = | | 1) 100 * 100 - 7 * 7 = 9951 |
| 2) | 390 * 410 = | | 2) 400 * 400 - 10 * 10 = 159900 |
| 3) | 102 * 98 = | | 3) 100 * 100 - 2 * 2 = 9996 |
| 4) | 394 * 406 = | | 4) 400 * 400 - 6 * 6 = 159964 |
| 5) | 104 * 96 = | | 5) 100 * 100 - 4 * 4 = 9984 |
| 6) | 394 * 406 = | | 6) 400 * 400 - 6 * 6 = 159964 |
| 7) | 304 * 296 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 98 * 102 = | | 8) 100 * 100 - 2 * 2 = 9996 |
| 9) | 398 * 402 = | | 9) 400 * 400 - 2 * 2 = 159996 |
| 10) | 303 * 297 = | | 10) 300 * 300 - 3 * 3 = 89991 |
| 11) | 50 * 53 + 47 * 50 = | | 11) ( 53 + 47) * 50 = 5000 |
| 12) | 71 * 125 + 75 * 71 = | | 12) ( 125 + 75) * 71 = 14200 |
| 13) | 64 * 156 - 56 * 64 = | | 13) ( 156 - 56) * 64 = 6400 |
| 14) | 97 * 258 - 97 * 58 = | | 14) ( 258 - 58) * 97 = 19400 |
| 15) | 77 * 156 - 77 * 56 = | | 15) ( 156 - 56) * 77 = 7700 |
| 16) | 21 * 172 - 21 * 72 = | | 16) ( 172 - 72) * 21 = 2100 |
| 17) | 135 * 93 - 93 * 35 = | | 17) ( 135 - 35) * 93 = 9300 |
| 18) | 35 * 91 + 165 * 91 = | | 18) ( 165 + 35) * 91 = 18200 |
| 19) | 128 * 66 + 72 * 66 = | | 19) ( 128 + 72) * 66 = 13200 |
| 20) | 46 * 70 + 46 * 30 = | | 20) ( 30 + 70) * 46 = 4600 |
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Score: ______________ | |
