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 February 11 2026
09:26:43 PM | Wednesday February 11 2026
09:26:43 PMFlip Answers |
| 1) | 106 * 94 = | | 1) 100 * 100 - 6 * 6 = 9964 |
| 2) | 294 * 306 = | | 2) 300 * 300 - 6 * 6 = 89964 |
| 3) | 406 * 394 = | | 3) 400 * 400 - 6 * 6 = 159964 |
| 4) | 404 * 396 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 406 * 394 = | | 5) 400 * 400 - 6 * 6 = 159964 |
| 6) | 196 * 204 = | | 6) 200 * 200 - 4 * 4 = 39984 |
| 7) | 93 * 107 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 310 * 290 = | | 8) 300 * 300 - 10 * 10 = 89900 |
| 9) | 394 * 406 = | | 9) 400 * 400 - 6 * 6 = 159964 |
| 10) | 190 * 210 = | | 10) 200 * 200 - 10 * 10 = 39900 |
| 11) | 65 * 135 - 35 * 65 = | | 11) ( 135 - 35) * 65 = 6500 |
| 12) | 35 * 23 + 65 * 23 = | | 12) ( 65 + 35) * 23 = 2300 |
| 13) | 83 * 71 + 129 * 83 = | | 13) ( 129 + 71) * 83 = 16600 |
| 14) | 68 * 153 - 68 * 53 = | | 14) ( 153 - 53) * 68 = 6800 |
| 15) | 27 * 142 - 42 * 27 = | | 15) ( 142 - 42) * 27 = 2700 |
| 16) | 54 * 74 + 74 * 46 = | | 16) ( 46 + 54) * 74 = 7400 |
| 17) | 48 * 174 - 74 * 48 = | | 17) ( 174 - 74) * 48 = 4800 |
| 18) | 53 * 262 - 62 * 53 = | | 18) ( 262 - 62) * 53 = 10600 |
| 19) | 95 * 142 + 95 * 58 = | | 19) ( 142 + 58) * 95 = 19000 |
| 20) | 40 * 41 + 41 * 60 = | | 20) ( 60 + 40) * 41 = 4100 |
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Score: ______________ | |
