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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Thursday March 20 2025
08:16:54 AM | Thursday March 20 2025
08:16:54 AMFlip Answers |
| 1) | 402 * 398 = | | 1) 400 * 400 - 2 * 2 = 159996 |
| 2) | 196 * 204 = | | 2) 200 * 200 - 4 * 4 = 39984 |
| 3) | 106 * 94 = | | 3) 100 * 100 - 6 * 6 = 9964 |
| 4) | 404 * 396 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 392 * 408 = | | 5) 400 * 400 - 8 * 8 = 159936 |
| 6) | 196 * 204 = | | 6) 200 * 200 - 4 * 4 = 39984 |
| 7) | 406 * 394 = | | 7) 400 * 400 - 6 * 6 = 159964 |
| 8) | 110 * 90 = | | 8) 100 * 100 - 10 * 10 = 9900 |
| 9) | 390 * 410 = | | 9) 400 * 400 - 10 * 10 = 159900 |
| 10) | 405 * 395 = | | 10) 400 * 400 - 5 * 5 = 159975 |
| 11) | 147 * 25 - 25 * 47 = | | 11) ( 147 - 47) * 25 = 2500 |
| 12) | 49 * 270 - 49 * 70 = | | 12) ( 270 - 70) * 49 = 9800 |
| 13) | 166 * 93 - 66 * 93 = | | 13) ( 166 - 66) * 93 = 9300 |
| 14) | 80 * 157 + 43 * 80 = | | 14) ( 157 + 43) * 80 = 16000 |
| 15) | 250 * 41 - 41 * 50 = | | 15) ( 250 - 50) * 41 = 8200 |
| 16) | 70 * 36 + 64 * 70 = | | 16) ( 64 + 36) * 70 = 7000 |
| 17) | 49 * 92 + 92 * 51 = | | 17) ( 49 + 51) * 92 = 9200 |
| 18) | 49 * 249 - 49 * 49 = | | 18) ( 249 - 49) * 49 = 9800 |
| 19) | 95 * 67 + 95 * 33 = | | 19) ( 33 + 67) * 95 = 9500 |
| 20) | 174 * 35 - 35 * 74 = | | 20) ( 174 - 74) * 35 = 3500 |
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Score: ______________ | |
