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 13 2025
05:58:52 PM | Saturday December 13 2025
05:58:52 PMFlip Answers |
| 1) | 201 * 199 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 306 * 294 = | | 2) 300 * 300 - 6 * 6 = 89964 |
| 3) | 198 * 202 = | | 3) 200 * 200 - 2 * 2 = 39996 |
| 4) | 209 * 191 = | | 4) 200 * 200 - 9 * 9 = 39919 |
| 5) | 209 * 191 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 296 * 304 = | | 6) 300 * 300 - 4 * 4 = 89984 |
| 7) | 308 * 292 = | | 7) 300 * 300 - 8 * 8 = 89936 |
| 8) | 304 * 296 = | | 8) 300 * 300 - 4 * 4 = 89984 |
| 9) | 198 * 202 = | | 9) 200 * 200 - 2 * 2 = 39996 |
| 10) | 210 * 190 = | | 10) 200 * 200 - 10 * 10 = 39900 |
| 11) | 125 * 34 + 34 * 75 = | | 11) ( 125 + 75) * 34 = 6800 |
| 12) | 152 * 89 - 89 * 52 = | | 12) ( 152 - 52) * 89 = 8900 |
| 13) | 48 * 42 + 58 * 48 = | | 13) ( 42 + 58) * 48 = 4800 |
| 14) | 263 * 83 - 83 * 63 = | | 14) ( 263 - 63) * 83 = 16600 |
| 15) | 42 * 239 - 42 * 39 = | | 15) ( 239 - 39) * 42 = 8400 |
| 16) | 237 * 54 - 54 * 37 = | | 16) ( 237 - 37) * 54 = 10800 |
| 17) | 95 * 58 + 42 * 95 = | | 17) ( 42 + 58) * 95 = 9500 |
| 18) | 42 * 56 + 58 * 56 = | | 18) ( 58 + 42) * 56 = 5600 |
| 19) | 71 * 69 + 69 * 129 = | | 19) ( 129 + 71) * 69 = 13800 |
| 20) | 79 * 135 - 79 * 35 = | | 20) ( 135 - 35) * 79 = 7900 |
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Score: ______________ | |
