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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Wednesday November 19 2025
05:03:16 AM | Wednesday November 19 2025
05:03:16 AMFlip Answers |
| 1) | 290 * 310 = | | 1) 300 * 300 - 10 * 10 = 89900 |
| 2) | 396 * 404 = | | 2) 400 * 400 - 4 * 4 = 159984 |
| 3) | 196 * 204 = | | 3) 200 * 200 - 4 * 4 = 39984 |
| 4) | 199 * 201 = | | 4) 200 * 200 - 1 * 1 = 39999 |
| 5) | 399 * 401 = | | 5) 400 * 400 - 1 * 1 = 159999 |
| 6) | 294 * 306 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 308 * 292 = | | 7) 300 * 300 - 8 * 8 = 89936 |
| 8) | 109 * 91 = | | 8) 100 * 100 - 9 * 9 = 9919 |
| 9) | 393 * 407 = | | 9) 400 * 400 - 7 * 7 = 159951 |
| 10) | 302 * 298 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 58 * 159 - 58 * 59 = | | 11) ( 159 - 59) * 58 = 5800 |
| 12) | 95 * 271 - 95 * 71 = | | 12) ( 271 - 71) * 95 = 19000 |
| 13) | 35 * 60 + 165 * 60 = | | 13) ( 165 + 35) * 60 = 12000 |
| 14) | 51 * 30 + 30 * 49 = | | 14) ( 51 + 49) * 30 = 3000 |
| 15) | 71 * 158 - 71 * 58 = | | 15) ( 158 - 58) * 71 = 7100 |
| 16) | 27 * 241 - 27 * 41 = | | 16) ( 241 - 41) * 27 = 5400 |
| 17) | 57 * 154 - 54 * 57 = | | 17) ( 154 - 54) * 57 = 5700 |
| 18) | 138 * 81 + 81 * 62 = | | 18) ( 138 + 62) * 81 = 16200 |
| 19) | 40 * 47 + 40 * 153 = | | 19) ( 153 + 47) * 40 = 8000 |
| 20) | 52 * 57 + 48 * 57 = | | 20) ( 52 + 48) * 57 = 5700 |
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Score: ______________ | |
