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 July 21 2026
04:30:01 PM | Tuesday July 21 2026
04:30:01 PMFlip Answers |
| 1) | 94 * 106 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 190 * 210 = | | 2) 200 * 200 - 10 * 10 = 39900 |
| 3) | 292 * 308 = | | 3) 300 * 300 - 8 * 8 = 89936 |
| 4) | 210 * 190 = | | 4) 200 * 200 - 10 * 10 = 39900 |
| 5) | 410 * 390 = | | 5) 400 * 400 - 10 * 10 = 159900 |
| 6) | 403 * 397 = | | 6) 400 * 400 - 3 * 3 = 159991 |
| 7) | 296 * 304 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 401 * 399 = | | 8) 400 * 400 - 1 * 1 = 159999 |
| 9) | 391 * 409 = | | 9) 400 * 400 - 9 * 9 = 159919 |
| 10) | 390 * 410 = | | 10) 400 * 400 - 10 * 10 = 159900 |
| 11) | 149 * 61 + 61 * 51 = | | 11) ( 149 + 51) * 61 = 12200 |
| 12) | 144 * 74 - 44 * 74 = | | 12) ( 144 - 44) * 74 = 7400 |
| 13) | 22 * 48 + 152 * 22 = | | 13) ( 152 + 48) * 22 = 4400 |
| 14) | 31 * 49 + 51 * 31 = | | 14) ( 51 + 49) * 31 = 3100 |
| 15) | 164 * 70 - 64 * 70 = | | 15) ( 164 - 64) * 70 = 7000 |
| 16) | 153 * 30 - 30 * 53 = | | 16) ( 153 - 53) * 30 = 3000 |
| 17) | 56 * 60 + 44 * 60 = | | 17) ( 44 + 56) * 60 = 6000 |
| 18) | 74 * 162 - 62 * 74 = | | 18) ( 162 - 62) * 74 = 7400 |
| 19) | 266 * 25 - 25 * 66 = | | 19) ( 266 - 66) * 25 = 5000 |
| 20) | 259 * 28 - 28 * 59 = | | 20) ( 259 - 59) * 28 = 5600 |
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Score: ______________ | |
