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 March 03 2026
06:50:07 PM | Tuesday March 03 2026
06:50:07 PMFlip Answers |
| 1) | 408 * 392 = | | 1) 400 * 400 - 8 * 8 = 159936 |
| 2) | 402 * 398 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 299 * 301 = | | 3) 300 * 300 - 1 * 1 = 89999 |
| 4) | 94 * 106 = | | 4) 100 * 100 - 6 * 6 = 9964 |
| 5) | 395 * 405 = | | 5) 400 * 400 - 5 * 5 = 159975 |
| 6) | 202 * 198 = | | 6) 200 * 200 - 2 * 2 = 39996 |
| 7) | 392 * 408 = | | 7) 400 * 400 - 8 * 8 = 159936 |
| 8) | 396 * 404 = | | 8) 400 * 400 - 4 * 4 = 159984 |
| 9) | 395 * 405 = | | 9) 400 * 400 - 5 * 5 = 159975 |
| 10) | 95 * 105 = | | 10) 100 * 100 - 5 * 5 = 9975 |
| 11) | 59 * 166 - 66 * 59 = | | 11) ( 166 - 66) * 59 = 5900 |
| 12) | 81 * 50 + 150 * 81 = | | 12) ( 150 + 50) * 81 = 16200 |
| 13) | 42 * 150 - 42 * 50 = | | 13) ( 150 - 50) * 42 = 4200 |
| 14) | 81 * 54 + 46 * 81 = | | 14) ( 54 + 46) * 81 = 8100 |
| 15) | 135 * 75 - 35 * 75 = | | 15) ( 135 - 35) * 75 = 7500 |
| 16) | 60 * 171 - 60 * 71 = | | 16) ( 171 - 71) * 60 = 6000 |
| 17) | 245 * 35 - 45 * 35 = | | 17) ( 245 - 45) * 35 = 7000 |
| 18) | 38 * 76 + 162 * 76 = | | 18) ( 162 + 38) * 76 = 15200 |
| 19) | 58 * 237 - 58 * 37 = | | 19) ( 237 - 37) * 58 = 11600 |
| 20) | 154 * 60 - 54 * 60 = | | 20) ( 154 - 54) * 60 = 6000 |
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Score: ______________ | |
