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 May 24 2026
10:22:06 AM | Sunday May 24 2026
10:22:06 AMFlip Answers |
| 1) | 203 * 197 = | | 1) 200 * 200 - 3 * 3 = 39991 |
| 2) | 394 * 406 = | | 2) 400 * 400 - 6 * 6 = 159964 |
| 3) | 94 * 106 = | | 3) 100 * 100 - 6 * 6 = 9964 |
| 4) | 208 * 192 = | | 4) 200 * 200 - 8 * 8 = 39936 |
| 5) | 195 * 205 = | | 5) 200 * 200 - 5 * 5 = 39975 |
| 6) | 396 * 404 = | | 6) 400 * 400 - 4 * 4 = 159984 |
| 7) | 192 * 208 = | | 7) 200 * 200 - 8 * 8 = 39936 |
| 8) | 398 * 402 = | | 8) 400 * 400 - 2 * 2 = 159996 |
| 9) | 207 * 193 = | | 9) 200 * 200 - 7 * 7 = 39951 |
| 10) | 401 * 399 = | | 10) 400 * 400 - 1 * 1 = 159999 |
| 11) | 21 * 275 - 21 * 75 = | | 11) ( 275 - 75) * 21 = 4200 |
| 12) | 95 * 139 + 95 * 61 = | | 12) ( 139 + 61) * 95 = 19000 |
| 13) | 54 * 52 + 148 * 54 = | | 13) ( 148 + 52) * 54 = 10800 |
| 14) | 139 * 42 + 61 * 42 = | | 14) ( 139 + 61) * 42 = 8400 |
| 15) | 96 * 169 - 69 * 96 = | | 15) ( 169 - 69) * 96 = 9600 |
| 16) | 45 * 58 + 58 * 155 = | | 16) ( 155 + 45) * 58 = 11600 |
| 17) | 56 * 92 + 44 * 92 = | | 17) ( 56 + 44) * 92 = 9200 |
| 18) | 68 * 81 + 81 * 132 = | | 18) ( 132 + 68) * 81 = 16200 |
| 19) | 72 * 142 - 72 * 42 = | | 19) ( 142 - 42) * 72 = 7200 |
| 20) | 154 * 90 + 46 * 90 = | | 20) ( 154 + 46) * 90 = 18000 |
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Score: ______________ | |
