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 14 2026
05:57:27 AM | Tuesday July 14 2026
05:57:27 AMFlip Answers |
| 1) | 398 * 402 = | | 1) 400 * 400 - 2 * 2 = 159996 |
| 2) | 102 * 98 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 295 * 305 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 397 * 403 = | | 4) 400 * 400 - 3 * 3 = 159991 |
| 5) | 290 * 310 = | | 5) 300 * 300 - 10 * 10 = 89900 |
| 6) | 296 * 304 = | | 6) 300 * 300 - 4 * 4 = 89984 |
| 7) | 97 * 103 = | | 7) 100 * 100 - 3 * 3 = 9991 |
| 8) | 301 * 299 = | | 8) 300 * 300 - 1 * 1 = 89999 |
| 9) | 391 * 409 = | | 9) 400 * 400 - 9 * 9 = 159919 |
| 10) | 291 * 309 = | | 10) 300 * 300 - 9 * 9 = 89919 |
| 11) | 46 * 74 + 46 * 26 = | | 11) ( 26 + 74) * 46 = 4600 |
| 12) | 143 * 60 + 57 * 60 = | | 12) ( 143 + 57) * 60 = 12000 |
| 13) | 160 * 88 - 60 * 88 = | | 13) ( 160 - 60) * 88 = 8800 |
| 14) | 43 * 81 + 57 * 81 = | | 14) ( 43 + 57) * 81 = 8100 |
| 15) | 50 * 64 + 64 * 50 = | | 15) ( 50 + 50) * 64 = 6400 |
| 16) | 54 * 46 + 54 * 54 = | | 16) ( 46 + 54) * 54 = 5400 |
| 17) | 64 * 147 - 64 * 47 = | | 17) ( 147 - 47) * 64 = 6400 |
| 18) | 21 * 148 - 48 * 21 = | | 18) ( 148 - 48) * 21 = 2100 |
| 19) | 21 * 250 - 21 * 50 = | | 19) ( 250 - 50) * 21 = 4200 |
| 20) | 54 * 88 + 46 * 88 = | | 20) ( 46 + 54) * 88 = 8800 |
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Score: ______________ | |
