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 December 21 2025
02:55:08 AM | Sunday December 21 2025
02:55:08 AMFlip Answers |
| 1) | 96 * 104 = | | 1) 100 * 100 - 4 * 4 = 9984 |
| 2) | 294 * 306 = | | 2) 300 * 300 - 6 * 6 = 89964 |
| 3) | 391 * 409 = | | 3) 400 * 400 - 9 * 9 = 159919 |
| 4) | 108 * 92 = | | 4) 100 * 100 - 8 * 8 = 9936 |
| 5) | 392 * 408 = | | 5) 400 * 400 - 8 * 8 = 159936 |
| 6) | 410 * 390 = | | 6) 400 * 400 - 10 * 10 = 159900 |
| 7) | 109 * 91 = | | 7) 100 * 100 - 9 * 9 = 9919 |
| 8) | 306 * 294 = | | 8) 300 * 300 - 6 * 6 = 89964 |
| 9) | 202 * 198 = | | 9) 200 * 200 - 2 * 2 = 39996 |
| 10) | 310 * 290 = | | 10) 300 * 300 - 10 * 10 = 89900 |
| 11) | 36 * 40 + 40 * 64 = | | 11) ( 36 + 64) * 40 = 4000 |
| 12) | 45 * 253 - 53 * 45 = | | 12) ( 253 - 53) * 45 = 9000 |
| 13) | 75 * 22 + 125 * 22 = | | 13) ( 125 + 75) * 22 = 4400 |
| 14) | 97 * 135 - 35 * 97 = | | 14) ( 135 - 35) * 97 = 9700 |
| 15) | 245 * 71 - 71 * 45 = | | 15) ( 245 - 45) * 71 = 14200 |
| 16) | 260 * 32 - 32 * 60 = | | 16) ( 260 - 60) * 32 = 6400 |
| 17) | 65 * 53 + 135 * 53 = | | 17) ( 135 + 65) * 53 = 10600 |
| 18) | 28 * 271 - 28 * 71 = | | 18) ( 271 - 71) * 28 = 5600 |
| 19) | 55 * 71 + 55 * 29 = | | 19) ( 29 + 71) * 55 = 5500 |
| 20) | 65 * 169 - 69 * 65 = | | 20) ( 169 - 69) * 65 = 6500 |
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Score: ______________ | |
