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 January 02 2026
04:46:30 PM | Friday January 02 2026
04:46:30 PMFlip Answers |
| 1) | 204 * 196 = | | 1) 200 * 200 - 4 * 4 = 39984 |
| 2) | 403 * 397 = | | 2) 400 * 400 - 3 * 3 = 159991 |
| 3) | 106 * 94 = | | 3) 100 * 100 - 6 * 6 = 9964 |
| 4) | 397 * 403 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 290 * 310 = | | 5) 300 * 300 - 10 * 10 = 89900 |
| 6) | 306 * 294 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 291 * 309 = | | 7) 300 * 300 - 9 * 9 = 89919 |
| 8) | 306 * 294 = | | 8) 300 * 300 - 6 * 6 = 89964 |
| 9) | 296 * 304 = | | 9) 300 * 300 - 4 * 4 = 89984 |
| 10) | 396 * 404 = | | 10) 400 * 400 - 4 * 4 = 159984 |
| 11) | 66 * 30 + 30 * 34 = | | 11) ( 34 + 66) * 30 = 3000 |
| 12) | 65 * 246 - 46 * 65 = | | 12) ( 246 - 46) * 65 = 13000 |
| 13) | 82 * 62 + 82 * 38 = | | 13) ( 38 + 62) * 82 = 8200 |
| 14) | 172 * 47 - 47 * 72 = | | 14) ( 172 - 72) * 47 = 4700 |
| 15) | 64 * 268 - 64 * 68 = | | 15) ( 268 - 68) * 64 = 12800 |
| 16) | 24 * 64 + 24 * 136 = | | 16) ( 136 + 64) * 24 = 4800 |
| 17) | 72 * 81 + 81 * 28 = | | 17) ( 28 + 72) * 81 = 8100 |
| 18) | 92 * 275 - 92 * 75 = | | 18) ( 275 - 75) * 92 = 18400 |
| 19) | 91 * 45 + 91 * 155 = | | 19) ( 155 + 45) * 91 = 18200 |
| 20) | 37 * 80 + 163 * 80 = | | 20) ( 163 + 37) * 80 = 16000 |
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Score: ______________ | |
