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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Sunday November 30 2025
02:19:53 AM | Sunday November 30 2025
02:19:53 AMFlip Answers |
| 1) | 396 * 404 = | | 1) 400 * 400 - 4 * 4 = 159984 |
| 2) | 199 * 201 = | | 2) 200 * 200 - 1 * 1 = 39999 |
| 3) | 107 * 93 = | | 3) 100 * 100 - 7 * 7 = 9951 |
| 4) | 408 * 392 = | | 4) 400 * 400 - 8 * 8 = 159936 |
| 5) | 403 * 397 = | | 5) 400 * 400 - 3 * 3 = 159991 |
| 6) | 97 * 103 = | | 6) 100 * 100 - 3 * 3 = 9991 |
| 7) | 307 * 293 = | | 7) 300 * 300 - 7 * 7 = 89951 |
| 8) | 101 * 99 = | | 8) 100 * 100 - 1 * 1 = 9999 |
| 9) | 405 * 395 = | | 9) 400 * 400 - 5 * 5 = 159975 |
| 10) | 308 * 292 = | | 10) 300 * 300 - 8 * 8 = 89936 |
| 11) | 61 * 133 + 61 * 67 = | | 11) ( 133 + 67) * 61 = 12200 |
| 12) | 54 * 91 + 46 * 91 = | | 12) ( 54 + 46) * 91 = 9100 |
| 13) | 54 * 155 - 55 * 54 = | | 13) ( 155 - 55) * 54 = 5400 |
| 14) | 63 * 30 + 137 * 30 = | | 14) ( 137 + 63) * 30 = 6000 |
| 15) | 152 * 48 - 48 * 52 = | | 15) ( 152 - 52) * 48 = 4800 |
| 16) | 46 * 68 + 54 * 68 = | | 16) ( 46 + 54) * 68 = 6800 |
| 17) | 38 * 83 + 62 * 83 = | | 17) ( 38 + 62) * 83 = 8300 |
| 18) | 37 * 271 - 37 * 71 = | | 18) ( 271 - 71) * 37 = 7400 |
| 19) | 94 * 37 + 94 * 63 = | | 19) ( 37 + 63) * 94 = 9400 |
| 20) | 148 * 95 - 48 * 95 = | | 20) ( 148 - 48) * 95 = 9500 |
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Score: ______________ | |
