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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Monday June 08 2026
09:16:00 PM | Monday June 08 2026
09:16:00 PMFlip Answers |
| 1) | 94 * 106 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 396 * 404 = | | 2) 400 * 400 - 4 * 4 = 159984 |
| 3) | 110 * 90 = | | 3) 100 * 100 - 10 * 10 = 9900 |
| 4) | 391 * 409 = | | 4) 400 * 400 - 9 * 9 = 159919 |
| 5) | 208 * 192 = | | 5) 200 * 200 - 8 * 8 = 39936 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 98 * 102 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 398 * 402 = | | 8) 400 * 400 - 2 * 2 = 159996 |
| 9) | 99 * 101 = | | 9) 100 * 100 - 1 * 1 = 9999 |
| 10) | 408 * 392 = | | 10) 400 * 400 - 8 * 8 = 159936 |
| 11) | 59 * 74 + 59 * 126 = | | 11) ( 126 + 74) * 59 = 11800 |
| 12) | 142 * 54 - 54 * 42 = | | 12) ( 142 - 42) * 54 = 5400 |
| 13) | 243 * 62 - 62 * 43 = | | 13) ( 243 - 43) * 62 = 12400 |
| 14) | 50 * 41 + 50 * 41 = | | 14) ( 50 + 50) * 41 = 4100 |
| 15) | 163 * 53 + 37 * 53 = | | 15) ( 163 + 37) * 53 = 10600 |
| 16) | 69 * 92 + 92 * 31 = | | 16) ( 31 + 69) * 92 = 9200 |
| 17) | 246 * 21 - 46 * 21 = | | 17) ( 246 - 46) * 21 = 4200 |
| 18) | 84 * 162 - 62 * 84 = | | 18) ( 162 - 62) * 84 = 8400 |
| 19) | 64 * 81 + 81 * 136 = | | 19) ( 136 + 64) * 81 = 16200 |
| 20) | 40 * 69 + 40 * 31 = | | 20) ( 31 + 69) * 40 = 4000 |
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Score: ______________ | |
