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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Thursday October 01 2026
07:14:45 AM | Thursday October 01 2026
07:14:45 AMFlip Answers |
| 1) | 306 * 294 = | | 1) 300 * 300 - 6 * 6 = 89964 |
| 2) | 291 * 309 = | | 2) 300 * 300 - 9 * 9 = 89919 |
| 3) | 290 * 310 = | | 3) 300 * 300 - 10 * 10 = 89900 |
| 4) | 398 * 402 = | | 4) 400 * 400 - 2 * 2 = 159996 |
| 5) | 296 * 304 = | | 5) 300 * 300 - 4 * 4 = 89984 |
| 6) | 304 * 296 = | | 6) 300 * 300 - 4 * 4 = 89984 |
| 7) | 403 * 397 = | | 7) 400 * 400 - 3 * 3 = 159991 |
| 8) | 409 * 391 = | | 8) 400 * 400 - 9 * 9 = 159919 |
| 9) | 205 * 195 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 91 * 109 = | | 10) 100 * 100 - 9 * 9 = 9919 |
| 11) | 97 * 137 + 63 * 97 = | | 11) ( 137 + 63) * 97 = 19400 |
| 12) | 248 * 68 - 48 * 68 = | | 12) ( 248 - 48) * 68 = 13600 |
| 13) | 47 * 37 + 63 * 47 = | | 13) ( 37 + 63) * 47 = 4700 |
| 14) | 26 * 97 + 74 * 97 = | | 14) ( 26 + 74) * 97 = 9700 |
| 15) | 57 * 272 - 57 * 72 = | | 15) ( 272 - 72) * 57 = 11400 |
| 16) | 244 * 25 - 25 * 44 = | | 16) ( 244 - 44) * 25 = 5000 |
| 17) | 27 * 66 + 27 * 34 = | | 17) ( 34 + 66) * 27 = 2700 |
| 18) | 138 * 45 + 62 * 45 = | | 18) ( 138 + 62) * 45 = 9000 |
| 19) | 151 * 51 - 51 * 51 = | | 19) ( 151 - 51) * 51 = 5100 |
| 20) | 32 * 58 + 42 * 32 = | | 20) ( 58 + 42) * 32 = 3200 |
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Score: ______________ | |
