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 January 27 2026
05:36:18 PM | Tuesday January 27 2026
05:36:18 PMFlip Answers |
| 1) | 199 * 201 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 105 * 95 = | | 2) 100 * 100 - 5 * 5 = 9975 |
| 3) | 294 * 306 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 391 * 409 = | | 4) 400 * 400 - 9 * 9 = 159919 |
| 5) | 196 * 204 = | | 5) 200 * 200 - 4 * 4 = 39984 |
| 6) | 98 * 102 = | | 6) 100 * 100 - 2 * 2 = 9996 |
| 7) | 91 * 109 = | | 7) 100 * 100 - 9 * 9 = 9919 |
| 8) | 209 * 191 = | | 8) 200 * 200 - 9 * 9 = 39919 |
| 9) | 194 * 206 = | | 9) 200 * 200 - 6 * 6 = 39964 |
| 10) | 296 * 304 = | | 10) 300 * 300 - 4 * 4 = 89984 |
| 11) | 64 * 40 + 160 * 64 = | | 11) ( 160 + 40) * 64 = 12800 |
| 12) | 32 * 250 - 50 * 32 = | | 12) ( 250 - 50) * 32 = 6400 |
| 13) | 34 * 52 + 52 * 66 = | | 13) ( 34 + 66) * 52 = 5200 |
| 14) | 40 * 83 + 83 * 60 = | | 14) ( 40 + 60) * 83 = 8300 |
| 15) | 81 * 238 - 81 * 38 = | | 15) ( 238 - 38) * 81 = 16200 |
| 16) | 52 * 59 + 41 * 52 = | | 16) ( 59 + 41) * 52 = 5200 |
| 17) | 41 * 30 + 70 * 41 = | | 17) ( 30 + 70) * 41 = 4100 |
| 18) | 265 * 81 - 65 * 81 = | | 18) ( 265 - 65) * 81 = 16200 |
| 19) | 84 * 127 + 73 * 84 = | | 19) ( 127 + 73) * 84 = 16800 |
| 20) | 85 * 44 + 56 * 85 = | | 20) ( 44 + 56) * 85 = 8500 |
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Score: ______________ | |
