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 14 2026
10:32:45 PM | Tuesday April 14 2026
10:32:45 PMFlip Answers |
| 1) | 99 * 101 = | | 1) 100 * 100 - 1 * 1 = 9999 |
| 2) | 104 * 96 = | | 2) 100 * 100 - 4 * 4 = 9984 |
| 3) | 290 * 310 = | | 3) 300 * 300 - 10 * 10 = 89900 |
| 4) | 193 * 207 = | | 4) 200 * 200 - 7 * 7 = 39951 |
| 5) | 210 * 190 = | | 5) 200 * 200 - 10 * 10 = 39900 |
| 6) | 396 * 404 = | | 6) 400 * 400 - 4 * 4 = 159984 |
| 7) | 295 * 305 = | | 7) 300 * 300 - 5 * 5 = 89975 |
| 8) | 93 * 107 = | | 8) 100 * 100 - 7 * 7 = 9951 |
| 9) | 406 * 394 = | | 9) 400 * 400 - 6 * 6 = 159964 |
| 10) | 92 * 108 = | | 10) 100 * 100 - 8 * 8 = 9936 |
| 11) | 133 * 87 + 67 * 87 = | | 11) ( 133 + 67) * 87 = 17400 |
| 12) | 71 * 236 - 71 * 36 = | | 12) ( 236 - 36) * 71 = 14200 |
| 13) | 58 * 55 + 45 * 58 = | | 13) ( 55 + 45) * 58 = 5800 |
| 14) | 74 * 86 + 86 * 126 = | | 14) ( 126 + 74) * 86 = 17200 |
| 15) | 67 * 26 + 133 * 26 = | | 15) ( 133 + 67) * 26 = 5200 |
| 16) | 36 * 71 + 71 * 164 = | | 16) ( 164 + 36) * 71 = 14200 |
| 17) | 167 * 52 - 52 * 67 = | | 17) ( 167 - 67) * 52 = 5200 |
| 18) | 35 * 247 - 47 * 35 = | | 18) ( 247 - 47) * 35 = 7000 |
| 19) | 66 * 159 - 59 * 66 = | | 19) ( 159 - 59) * 66 = 6600 |
| 20) | 142 * 37 - 37 * 42 = | | 20) ( 142 - 42) * 37 = 3700 |
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Score: ______________ | |
