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 February 26 2026
04:00:47 AM | Thursday February 26 2026
04:00:47 AMFlip Answers |
| 1) | 190 * 210 = | | 1) 200 * 200 - 10 * 10 = 39900 |
| 2) | 396 * 404 = | | 2) 400 * 400 - 4 * 4 = 159984 |
| 3) | 309 * 291 = | | 3) 300 * 300 - 9 * 9 = 89919 |
| 4) | 97 * 103 = | | 4) 100 * 100 - 3 * 3 = 9991 |
| 5) | 190 * 210 = | | 5) 200 * 200 - 10 * 10 = 39900 |
| 6) | 208 * 192 = | | 6) 200 * 200 - 8 * 8 = 39936 |
| 7) | 109 * 91 = | | 7) 100 * 100 - 9 * 9 = 9919 |
| 8) | 302 * 298 = | | 8) 300 * 300 - 2 * 2 = 89996 |
| 9) | 195 * 205 = | | 9) 200 * 200 - 5 * 5 = 39975 |
| 10) | 97 * 103 = | | 10) 100 * 100 - 3 * 3 = 9991 |
| 11) | 158 * 24 - 24 * 58 = | | 11) ( 158 - 58) * 24 = 2400 |
| 12) | 67 * 94 + 94 * 133 = | | 12) ( 133 + 67) * 94 = 18800 |
| 13) | 95 * 168 - 95 * 68 = | | 13) ( 168 - 68) * 95 = 9500 |
| 14) | 40 * 160 - 40 * 60 = | | 14) ( 160 - 60) * 40 = 4000 |
| 15) | 259 * 90 - 90 * 59 = | | 15) ( 259 - 59) * 90 = 18000 |
| 16) | 67 * 68 + 68 * 33 = | | 16) ( 33 + 67) * 68 = 6800 |
| 17) | 172 * 61 - 72 * 61 = | | 17) ( 172 - 72) * 61 = 6100 |
| 18) | 28 * 54 + 46 * 28 = | | 18) ( 46 + 54) * 28 = 2800 |
| 19) | 35 * 33 + 67 * 35 = | | 19) ( 33 + 67) * 35 = 3500 |
| 20) | 38 * 246 - 38 * 46 = | | 20) ( 246 - 46) * 38 = 7600 |
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Score: ______________ | |
