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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Sunday October 11 2026
05:38:38 PM | Sunday October 11 2026
05:38:38 PMFlip Answers |
| 1) | 295 * 305 = | | 1) 300 * 300 - 5 * 5 = 89975 |
| 2) | 296 * 304 = | | 2) 300 * 300 - 4 * 4 = 89984 |
| 3) | 291 * 309 = | | 3) 300 * 300 - 9 * 9 = 89919 |
| 4) | 96 * 104 = | | 4) 100 * 100 - 4 * 4 = 9984 |
| 5) | 109 * 91 = | | 5) 100 * 100 - 9 * 9 = 9919 |
| 6) | 303 * 297 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 210 * 190 = | | 7) 200 * 200 - 10 * 10 = 39900 |
| 8) | 208 * 192 = | | 8) 200 * 200 - 8 * 8 = 39936 |
| 9) | 98 * 102 = | | 9) 100 * 100 - 2 * 2 = 9996 |
| 10) | 98 * 102 = | | 10) 100 * 100 - 2 * 2 = 9996 |
| 11) | 39 * 41 + 39 * 159 = | | 11) ( 159 + 41) * 39 = 7800 |
| 12) | 25 * 40 + 25 * 160 = | | 12) ( 160 + 40) * 25 = 5000 |
| 13) | 23 * 237 - 37 * 23 = | | 13) ( 237 - 37) * 23 = 4600 |
| 14) | 49 * 46 + 51 * 46 = | | 14) ( 49 + 51) * 46 = 4600 |
| 15) | 274 * 86 - 86 * 74 = | | 15) ( 274 - 74) * 86 = 17200 |
| 16) | 87 * 136 - 36 * 87 = | | 16) ( 136 - 36) * 87 = 8700 |
| 17) | 36 * 63 + 36 * 37 = | | 17) ( 63 + 37) * 36 = 3600 |
| 18) | 66 * 237 - 66 * 37 = | | 18) ( 237 - 37) * 66 = 13200 |
| 19) | 90 * 60 + 90 * 40 = | | 19) ( 40 + 60) * 90 = 9000 |
| 20) | 41 * 23 + 59 * 23 = | | 20) ( 59 + 41) * 23 = 2300 |
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Score: ______________ | |
