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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Saturday December 27 2025
10:32:21 AM | Saturday December 27 2025
10:32:21 AMFlip Answers |
| 1) | 95 * 105 = | | 1) 100 * 100 - 5 * 5 = 9975 |
| 2) | 309 * 291 = | | 2) 300 * 300 - 9 * 9 = 89919 |
| 3) | 104 * 96 = | | 3) 100 * 100 - 4 * 4 = 9984 |
| 4) | 393 * 407 = | | 4) 400 * 400 - 7 * 7 = 159951 |
| 5) | 393 * 407 = | | 5) 400 * 400 - 7 * 7 = 159951 |
| 6) | 301 * 299 = | | 6) 300 * 300 - 1 * 1 = 89999 |
| 7) | 399 * 401 = | | 7) 400 * 400 - 1 * 1 = 159999 |
| 8) | 307 * 293 = | | 8) 300 * 300 - 7 * 7 = 89951 |
| 9) | 95 * 105 = | | 9) 100 * 100 - 5 * 5 = 9975 |
| 10) | 104 * 96 = | | 10) 100 * 100 - 4 * 4 = 9984 |
| 11) | 42 * 69 + 58 * 69 = | | 11) ( 42 + 58) * 69 = 6900 |
| 12) | 39 * 67 + 67 * 61 = | | 12) ( 39 + 61) * 67 = 6700 |
| 13) | 91 * 158 - 58 * 91 = | | 13) ( 158 - 58) * 91 = 9100 |
| 14) | 64 * 51 + 149 * 64 = | | 14) ( 149 + 51) * 64 = 12800 |
| 15) | 46 * 86 + 86 * 154 = | | 15) ( 154 + 46) * 86 = 17200 |
| 16) | 41 * 49 + 41 * 51 = | | 16) ( 49 + 51) * 41 = 4100 |
| 17) | 266 * 84 - 84 * 66 = | | 17) ( 266 - 66) * 84 = 16800 |
| 18) | 48 * 132 + 68 * 48 = | | 18) ( 132 + 68) * 48 = 9600 |
| 19) | 150 * 77 - 77 * 50 = | | 19) ( 150 - 50) * 77 = 7700 |
| 20) | 62 * 65 + 65 * 38 = | | 20) ( 38 + 62) * 65 = 6500 |
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Score: ______________ | |
