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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Sunday January 25 2026
06:38:58 AM | Sunday January 25 2026
06:38:58 AMFlip Answers |
| 1) | 199 * 201 = | | 1) 200 * 200 - 1 * 1 = 39999 |
| 2) | 204 * 196 = | | 2) 200 * 200 - 4 * 4 = 39984 |
| 3) | 292 * 308 = | | 3) 300 * 300 - 8 * 8 = 89936 |
| 4) | 94 * 106 = | | 4) 100 * 100 - 6 * 6 = 9964 |
| 5) | 199 * 201 = | | 5) 200 * 200 - 1 * 1 = 39999 |
| 6) | 309 * 291 = | | 6) 300 * 300 - 9 * 9 = 89919 |
| 7) | 305 * 295 = | | 7) 300 * 300 - 5 * 5 = 89975 |
| 8) | 97 * 103 = | | 8) 100 * 100 - 3 * 3 = 9991 |
| 9) | 102 * 98 = | | 9) 100 * 100 - 2 * 2 = 9996 |
| 10) | 408 * 392 = | | 10) 400 * 400 - 8 * 8 = 159936 |
| 11) | 139 * 69 - 39 * 69 = | | 11) ( 139 - 39) * 69 = 6900 |
| 12) | 70 * 45 + 70 * 155 = | | 12) ( 155 + 45) * 70 = 14000 |
| 13) | 159 * 92 - 59 * 92 = | | 13) ( 159 - 59) * 92 = 9200 |
| 14) | 43 * 92 + 57 * 92 = | | 14) ( 43 + 57) * 92 = 9200 |
| 15) | 60 * 26 + 140 * 26 = | | 15) ( 140 + 60) * 26 = 5200 |
| 16) | 246 * 85 - 85 * 46 = | | 16) ( 246 - 46) * 85 = 17000 |
| 17) | 29 * 163 - 29 * 63 = | | 17) ( 163 - 63) * 29 = 2900 |
| 18) | 259 * 24 - 59 * 24 = | | 18) ( 259 - 59) * 24 = 4800 |
| 19) | 259 * 31 - 31 * 59 = | | 19) ( 259 - 59) * 31 = 6200 |
| 20) | 66 * 32 + 66 * 68 = | | 20) ( 32 + 68) * 66 = 6600 |
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Score: ______________ | |
