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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Wednesday September 23 2026
10:10:30 PM | Wednesday September 23 2026
10:10:30 PMFlip Answers |
| 1) | 303 * 297 = | | 1) 300 * 300 - 3 * 3 = 89991 |
| 2) | 204 * 196 = | | 2) 200 * 200 - 4 * 4 = 39984 |
| 3) | 293 * 307 = | | 3) 300 * 300 - 7 * 7 = 89951 |
| 4) | 402 * 398 = | | 4) 400 * 400 - 2 * 2 = 159996 |
| 5) | 403 * 397 = | | 5) 400 * 400 - 3 * 3 = 159991 |
| 6) | 390 * 410 = | | 6) 400 * 400 - 10 * 10 = 159900 |
| 7) | 107 * 93 = | | 7) 100 * 100 - 7 * 7 = 9951 |
| 8) | 98 * 102 = | | 8) 100 * 100 - 2 * 2 = 9996 |
| 9) | 204 * 196 = | | 9) 200 * 200 - 4 * 4 = 39984 |
| 10) | 401 * 399 = | | 10) 400 * 400 - 1 * 1 = 159999 |
| 11) | 47 * 63 + 63 * 153 = | | 11) ( 153 + 47) * 63 = 12600 |
| 12) | 174 * 50 - 74 * 50 = | | 12) ( 174 - 74) * 50 = 5000 |
| 13) | 49 * 253 - 53 * 49 = | | 13) ( 253 - 53) * 49 = 9800 |
| 14) | 239 * 31 - 39 * 31 = | | 14) ( 239 - 39) * 31 = 6200 |
| 15) | 39 * 162 - 39 * 62 = | | 15) ( 162 - 62) * 39 = 3900 |
| 16) | 74 * 51 + 126 * 51 = | | 16) ( 126 + 74) * 51 = 10200 |
| 17) | 72 * 153 - 53 * 72 = | | 17) ( 153 - 53) * 72 = 7200 |
| 18) | 55 * 152 + 48 * 55 = | | 18) ( 152 + 48) * 55 = 11000 |
| 19) | 245 * 41 - 41 * 45 = | | 19) ( 245 - 45) * 41 = 8200 |
| 20) | 87 * 146 - 87 * 46 = | | 20) ( 146 - 46) * 87 = 8700 |
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Score: ______________ | |
