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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Thursday June 04 2026
04:07:54 PM | Thursday June 04 2026
04:07:54 PMFlip Answers |
| 1) | 395 * 405 = | | 1) 400 * 400 - 5 * 5 = 159975 |
| 2) | 108 * 92 = | | 2) 100 * 100 - 8 * 8 = 9936 |
| 3) | 99 * 101 = | | 3) 100 * 100 - 1 * 1 = 9999 |
| 4) | 296 * 304 = | | 4) 300 * 300 - 4 * 4 = 89984 |
| 5) | 304 * 296 = | | 5) 300 * 300 - 4 * 4 = 89984 |
| 6) | 207 * 193 = | | 6) 200 * 200 - 7 * 7 = 39951 |
| 7) | 104 * 96 = | | 7) 100 * 100 - 4 * 4 = 9984 |
| 8) | 94 * 106 = | | 8) 100 * 100 - 6 * 6 = 9964 |
| 9) | 196 * 204 = | | 9) 200 * 200 - 4 * 4 = 39984 |
| 10) | 192 * 208 = | | 10) 200 * 200 - 8 * 8 = 39936 |
| 11) | 174 * 38 - 74 * 38 = | | 11) ( 174 - 74) * 38 = 3800 |
| 12) | 268 * 41 - 41 * 68 = | | 12) ( 268 - 68) * 41 = 8200 |
| 13) | 68 * 74 + 68 * 26 = | | 13) ( 26 + 74) * 68 = 6800 |
| 14) | 64 * 59 + 136 * 59 = | | 14) ( 136 + 64) * 59 = 11800 |
| 15) | 250 * 45 - 50 * 45 = | | 15) ( 250 - 50) * 45 = 9000 |
| 16) | 145 * 72 - 72 * 45 = | | 16) ( 145 - 45) * 72 = 7200 |
| 17) | 57 * 133 + 57 * 67 = | | 17) ( 133 + 67) * 57 = 11400 |
| 18) | 90 * 152 - 90 * 52 = | | 18) ( 152 - 52) * 90 = 9000 |
| 19) | 49 * 45 + 45 * 51 = | | 19) ( 51 + 49) * 45 = 4500 |
| 20) | 72 * 139 + 72 * 61 = | | 20) ( 139 + 61) * 72 = 14400 |
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Score: ______________ | |
