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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Monday January 12 2026
03:52:23 AM | Monday January 12 2026
03:52:23 AMFlip Answers |
| 1) | 407 * 393 = | | 1) 400 * 400 - 7 * 7 = 159951 |
| 2) | 394 * 406 = | | 2) 400 * 400 - 6 * 6 = 159964 |
| 3) | 295 * 305 = | | 3) 300 * 300 - 5 * 5 = 89975 |
| 4) | 110 * 90 = | | 4) 100 * 100 - 10 * 10 = 9900 |
| 5) | 101 * 99 = | | 5) 100 * 100 - 1 * 1 = 9999 |
| 6) | 203 * 197 = | | 6) 200 * 200 - 3 * 3 = 39991 |
| 7) | 306 * 294 = | | 7) 300 * 300 - 6 * 6 = 89964 |
| 8) | 410 * 390 = | | 8) 400 * 400 - 10 * 10 = 159900 |
| 9) | 395 * 405 = | | 9) 400 * 400 - 5 * 5 = 159975 |
| 10) | 291 * 309 = | | 10) 300 * 300 - 9 * 9 = 89919 |
| 11) | 66 * 257 - 66 * 57 = | | 11) ( 257 - 57) * 66 = 13200 |
| 12) | 83 * 146 - 83 * 46 = | | 12) ( 146 - 46) * 83 = 8300 |
| 13) | 73 * 50 + 50 * 27 = | | 13) ( 27 + 73) * 50 = 5000 |
| 14) | 91 * 263 - 63 * 91 = | | 14) ( 263 - 63) * 91 = 18200 |
| 15) | 93 * 75 + 93 * 125 = | | 15) ( 125 + 75) * 93 = 18600 |
| 16) | 70 * 96 + 30 * 96 = | | 16) ( 30 + 70) * 96 = 9600 |
| 17) | 155 * 37 - 55 * 37 = | | 17) ( 155 - 55) * 37 = 3700 |
| 18) | 51 * 72 + 72 * 49 = | | 18) ( 49 + 51) * 72 = 7200 |
| 19) | 25 * 154 - 54 * 25 = | | 19) ( 154 - 54) * 25 = 2500 |
| 20) | 69 * 174 - 69 * 74 = | | 20) ( 174 - 74) * 69 = 6900 |
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Score: ______________ | |
