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 November 24 2025
08:46:17 PM | Monday November 24 2025
08:46:17 PMFlip Answers |
| 1) | 90 * 110 = | | 1) 100 * 100 - 10 * 10 = 9900 |
| 2) | 106 * 94 = | | 2) 100 * 100 - 6 * 6 = 9964 |
| 3) | 392 * 408 = | | 3) 400 * 400 - 8 * 8 = 159936 |
| 4) | 397 * 403 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 94 * 106 = | | 5) 100 * 100 - 6 * 6 = 9964 |
| 6) | 402 * 398 = | | 6) 400 * 400 - 2 * 2 = 159996 |
| 7) | 410 * 390 = | | 7) 400 * 400 - 10 * 10 = 159900 |
| 8) | 96 * 104 = | | 8) 100 * 100 - 4 * 4 = 9984 |
| 9) | 404 * 396 = | | 9) 400 * 400 - 4 * 4 = 159984 |
| 10) | 292 * 308 = | | 10) 300 * 300 - 8 * 8 = 89936 |
| 11) | 68 * 275 - 75 * 68 = | | 11) ( 275 - 75) * 68 = 13600 |
| 12) | 70 * 40 + 70 * 60 = | | 12) ( 40 + 60) * 70 = 7000 |
| 13) | 41 * 271 - 71 * 41 = | | 13) ( 271 - 71) * 41 = 8200 |
| 14) | 65 * 238 - 38 * 65 = | | 14) ( 238 - 38) * 65 = 13000 |
| 15) | 63 * 241 - 63 * 41 = | | 15) ( 241 - 41) * 63 = 12600 |
| 16) | 90 * 154 - 54 * 90 = | | 16) ( 154 - 54) * 90 = 9000 |
| 17) | 64 * 43 + 36 * 43 = | | 17) ( 64 + 36) * 43 = 4300 |
| 18) | 49 * 48 + 152 * 49 = | | 18) ( 152 + 48) * 49 = 9800 |
| 19) | 64 * 52 + 36 * 52 = | | 19) ( 36 + 64) * 52 = 5200 |
| 20) | 139 * 68 + 61 * 68 = | | 20) ( 139 + 61) * 68 = 13600 |
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Score: ______________ | |
