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 December 30 2025
01:23:36 AM | Tuesday December 30 2025
01:23:36 AMFlip Answers |
| 1) | 305 * 295 = | | 1) 300 * 300 - 5 * 5 = 89975 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 309 * 291 = | | 3) 300 * 300 - 9 * 9 = 89919 |
| 4) | 104 * 96 = | | 4) 100 * 100 - 4 * 4 = 9984 |
| 5) | 103 * 97 = | | 5) 100 * 100 - 3 * 3 = 9991 |
| 6) | 199 * 201 = | | 6) 200 * 200 - 1 * 1 = 39999 |
| 7) | 397 * 403 = | | 7) 400 * 400 - 3 * 3 = 159991 |
| 8) | 304 * 296 = | | 8) 300 * 300 - 4 * 4 = 89984 |
| 9) | 92 * 108 = | | 9) 100 * 100 - 8 * 8 = 9936 |
| 10) | 309 * 291 = | | 10) 300 * 300 - 9 * 9 = 89919 |
| 11) | 30 * 42 + 58 * 30 = | | 11) ( 58 + 42) * 30 = 3000 |
| 12) | 70 * 53 + 53 * 30 = | | 12) ( 30 + 70) * 53 = 5300 |
| 13) | 50 * 37 + 37 * 150 = | | 13) ( 150 + 50) * 37 = 7400 |
| 14) | 136 * 34 - 34 * 36 = | | 14) ( 136 - 36) * 34 = 3400 |
| 15) | 73 * 82 + 27 * 82 = | | 15) ( 27 + 73) * 82 = 8200 |
| 16) | 142 * 67 - 42 * 67 = | | 16) ( 142 - 42) * 67 = 6700 |
| 17) | 21 * 64 + 136 * 21 = | | 17) ( 136 + 64) * 21 = 4200 |
| 18) | 29 * 262 - 29 * 62 = | | 18) ( 262 - 62) * 29 = 5800 |
| 19) | 148 * 82 - 82 * 48 = | | 19) ( 148 - 48) * 82 = 8200 |
| 20) | 239 * 31 - 39 * 31 = | | 20) ( 239 - 39) * 31 = 6200 |
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Score: ______________ | |
