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 May 05 2026
06:48:46 PM | Tuesday May 05 2026
06:48:46 PMFlip Answers |
| 1) | 190 * 210 = | | 1) 200 * 200 - 10 * 10 = 39900 |
| 2) | 103 * 97 = | | 2) 100 * 100 - 3 * 3 = 9991 |
| 3) | 98 * 102 = | | 3) 100 * 100 - 2 * 2 = 9996 |
| 4) | 294 * 306 = | | 4) 300 * 300 - 6 * 6 = 89964 |
| 5) | 304 * 296 = | | 5) 300 * 300 - 4 * 4 = 89984 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 192 * 208 = | | 7) 200 * 200 - 8 * 8 = 39936 |
| 8) | 305 * 295 = | | 8) 300 * 300 - 5 * 5 = 89975 |
| 9) | 196 * 204 = | | 9) 200 * 200 - 4 * 4 = 39984 |
| 10) | 399 * 401 = | | 10) 400 * 400 - 1 * 1 = 159999 |
| 11) | 37 * 53 + 53 * 163 = | | 11) ( 163 + 37) * 53 = 10600 |
| 12) | 73 * 54 + 146 * 73 = | | 12) ( 146 + 54) * 73 = 14600 |
| 13) | 90 * 255 - 90 * 55 = | | 13) ( 255 - 55) * 90 = 18000 |
| 14) | 150 * 65 - 65 * 50 = | | 14) ( 150 - 50) * 65 = 6500 |
| 15) | 97 * 166 - 66 * 97 = | | 15) ( 166 - 66) * 97 = 9700 |
| 16) | 237 * 54 - 37 * 54 = | | 16) ( 237 - 37) * 54 = 10800 |
| 17) | 42 * 81 + 158 * 81 = | | 17) ( 158 + 42) * 81 = 16200 |
| 18) | 267 * 54 - 54 * 67 = | | 18) ( 267 - 67) * 54 = 10800 |
| 19) | 26 * 72 + 74 * 72 = | | 19) ( 26 + 74) * 72 = 7200 |
| 20) | 48 * 32 + 68 * 48 = | | 20) ( 32 + 68) * 48 = 4800 |
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Score: ______________ | |
