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 August 25 2026
06:20:57 AM | Tuesday August 25 2026
06:20:57 AMFlip Answers |
| 1) | 205 * 195 = | | 1) 200 * 200 - 5 * 5 = 39975 |
| 2) | 303 * 297 = | | 2) 300 * 300 - 3 * 3 = 89991 |
| 3) | 294 * 306 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 94 * 106 = | | 4) 100 * 100 - 6 * 6 = 9964 |
| 5) | 191 * 209 = | | 5) 200 * 200 - 9 * 9 = 39919 |
| 6) | 306 * 294 = | | 6) 300 * 300 - 6 * 6 = 89964 |
| 7) | 106 * 94 = | | 7) 100 * 100 - 6 * 6 = 9964 |
| 8) | 209 * 191 = | | 8) 200 * 200 - 9 * 9 = 39919 |
| 9) | 307 * 293 = | | 9) 300 * 300 - 7 * 7 = 89951 |
| 10) | 108 * 92 = | | 10) 100 * 100 - 8 * 8 = 9936 |
| 11) | 40 * 48 + 60 * 48 = | | 11) ( 60 + 40) * 48 = 4800 |
| 12) | 74 * 129 + 74 * 71 = | | 12) ( 129 + 71) * 74 = 14800 |
| 13) | 66 * 36 + 66 * 64 = | | 13) ( 36 + 64) * 66 = 6600 |
| 14) | 45 * 253 - 45 * 53 = | | 14) ( 253 - 53) * 45 = 9000 |
| 15) | 38 * 153 - 53 * 38 = | | 15) ( 153 - 53) * 38 = 3800 |
| 16) | 76 * 39 + 61 * 76 = | | 16) ( 61 + 39) * 76 = 7600 |
| 17) | 85 * 56 + 144 * 85 = | | 17) ( 144 + 56) * 85 = 17000 |
| 18) | 22 * 38 + 22 * 62 = | | 18) ( 38 + 62) * 22 = 2200 |
| 19) | 25 * 42 + 25 * 158 = | | 19) ( 158 + 42) * 25 = 5000 |
| 20) | 62 * 40 + 38 * 40 = | | 20) ( 62 + 38) * 40 = 4000 |
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Score: ______________ | |
