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 10 2026
04:19:52 PM | Tuesday March 10 2026
04:19:52 PMFlip Answers |
| 1) | 394 * 406 = | | 1) 400 * 400 - 6 * 6 = 159964 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 195 * 205 = | | 3) 200 * 200 - 5 * 5 = 39975 |
| 4) | 392 * 408 = | | 4) 400 * 400 - 8 * 8 = 159936 |
| 5) | 304 * 296 = | | 5) 300 * 300 - 4 * 4 = 89984 |
| 6) | 98 * 102 = | | 6) 100 * 100 - 2 * 2 = 9996 |
| 7) | 102 * 98 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 393 * 407 = | | 8) 400 * 400 - 7 * 7 = 159951 |
| 9) | 96 * 104 = | | 9) 100 * 100 - 4 * 4 = 9984 |
| 10) | 208 * 192 = | | 10) 200 * 200 - 8 * 8 = 39936 |
| 11) | 52 * 96 + 96 * 48 = | | 11) ( 48 + 52) * 96 = 9600 |
| 12) | 90 * 173 - 90 * 73 = | | 12) ( 173 - 73) * 90 = 9000 |
| 13) | 40 * 49 + 51 * 40 = | | 13) ( 51 + 49) * 40 = 4000 |
| 14) | 65 * 56 + 65 * 144 = | | 14) ( 144 + 56) * 65 = 13000 |
| 15) | 87 * 50 + 87 * 50 = | | 15) ( 50 + 50) * 87 = 8700 |
| 16) | 148 * 80 - 80 * 48 = | | 16) ( 148 - 48) * 80 = 8000 |
| 17) | 79 * 42 + 58 * 79 = | | 17) ( 58 + 42) * 79 = 7900 |
| 18) | 83 * 67 + 133 * 83 = | | 18) ( 133 + 67) * 83 = 16600 |
| 19) | 30 * 60 + 30 * 40 = | | 19) ( 60 + 40) * 30 = 3000 |
| 20) | 65 * 244 - 44 * 65 = | | 20) ( 244 - 44) * 65 = 13000 |
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Score: ______________ | |
