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 August 20 2026
02:44:46 AM | Thursday August 20 2026
02:44:46 AMFlip Answers |
| 1) | 103 * 97 = | | 1) 100 * 100 - 3 * 3 = 9991 |
| 2) | 396 * 404 = | | 2) 400 * 400 - 4 * 4 = 159984 |
| 3) | 206 * 194 = | | 3) 200 * 200 - 6 * 6 = 39964 |
| 4) | 290 * 310 = | | 4) 300 * 300 - 10 * 10 = 89900 |
| 5) | 309 * 291 = | | 5) 300 * 300 - 9 * 9 = 89919 |
| 6) | 308 * 292 = | | 6) 300 * 300 - 8 * 8 = 89936 |
| 7) | 295 * 305 = | | 7) 300 * 300 - 5 * 5 = 89975 |
| 8) | 309 * 291 = | | 8) 300 * 300 - 9 * 9 = 89919 |
| 9) | 310 * 290 = | | 9) 300 * 300 - 10 * 10 = 89900 |
| 10) | 294 * 306 = | | 10) 300 * 300 - 6 * 6 = 89964 |
| 11) | 94 * 52 + 148 * 94 = | | 11) ( 148 + 52) * 94 = 18800 |
| 12) | 52 * 52 + 52 * 148 = | | 12) ( 148 + 52) * 52 = 10400 |
| 13) | 31 * 37 + 63 * 31 = | | 13) ( 63 + 37) * 31 = 3100 |
| 14) | 45 * 237 - 45 * 37 = | | 14) ( 237 - 37) * 45 = 9000 |
| 15) | 77 * 151 - 51 * 77 = | | 15) ( 151 - 51) * 77 = 7700 |
| 16) | 69 * 69 + 69 * 131 = | | 16) ( 131 + 69) * 69 = 13800 |
| 17) | 51 * 162 - 62 * 51 = | | 17) ( 162 - 62) * 51 = 5100 |
| 18) | 67 * 87 + 133 * 87 = | | 18) ( 133 + 67) * 87 = 17400 |
| 19) | 47 * 37 + 47 * 63 = | | 19) ( 63 + 37) * 47 = 4700 |
| 20) | 33 * 248 - 48 * 33 = | | 20) ( 248 - 48) * 33 = 6600 |
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Score: ______________ | |
