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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Wednesday August 26 2026
07:15:46 AM | Wednesday August 26 2026
07:15:46 AMFlip Answers |
| 1) | 393 * 407 = | | 1) 400 * 400 - 7 * 7 = 159951 |
| 2) | 104 * 96 = | | 2) 100 * 100 - 4 * 4 = 9984 |
| 3) | 307 * 293 = | | 3) 300 * 300 - 7 * 7 = 89951 |
| 4) | 204 * 196 = | | 4) 200 * 200 - 4 * 4 = 39984 |
| 5) | 295 * 305 = | | 5) 300 * 300 - 5 * 5 = 89975 |
| 6) | 305 * 295 = | | 6) 300 * 300 - 5 * 5 = 89975 |
| 7) | 194 * 206 = | | 7) 200 * 200 - 6 * 6 = 39964 |
| 8) | 408 * 392 = | | 8) 400 * 400 - 8 * 8 = 159936 |
| 9) | 105 * 95 = | | 9) 100 * 100 - 5 * 5 = 9975 |
| 10) | 307 * 293 = | | 10) 300 * 300 - 7 * 7 = 89951 |
| 11) | 33 * 57 + 43 * 33 = | | 11) ( 43 + 57) * 33 = 3300 |
| 12) | 96 * 258 - 58 * 96 = | | 12) ( 258 - 58) * 96 = 19200 |
| 13) | 167 * 39 - 39 * 67 = | | 13) ( 167 - 67) * 39 = 3900 |
| 14) | 137 * 54 - 37 * 54 = | | 14) ( 137 - 37) * 54 = 5400 |
| 15) | 30 * 167 - 67 * 30 = | | 15) ( 167 - 67) * 30 = 3000 |
| 16) | 69 * 63 + 63 * 31 = | | 16) ( 31 + 69) * 63 = 6300 |
| 17) | 133 * 61 + 61 * 67 = | | 17) ( 133 + 67) * 61 = 12200 |
| 18) | 60 * 60 + 140 * 60 = | | 18) ( 140 + 60) * 60 = 12000 |
| 19) | 65 * 165 + 35 * 65 = | | 19) ( 165 + 35) * 65 = 13000 |
| 20) | 170 * 33 - 33 * 70 = | | 20) ( 170 - 70) * 33 = 3300 |
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Score: ______________ | |
