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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Saturday November 29 2025
02:08:21 PM | Saturday November 29 2025
02:08:21 PMFlip Answers |
| 1) | 293 * 307 = | | 1) 300 * 300 - 7 * 7 = 89951 |
| 2) | 292 * 308 = | | 2) 300 * 300 - 8 * 8 = 89936 |
| 3) | 296 * 304 = | | 3) 300 * 300 - 4 * 4 = 89984 |
| 4) | 399 * 401 = | | 4) 400 * 400 - 1 * 1 = 159999 |
| 5) | 392 * 408 = | | 5) 400 * 400 - 8 * 8 = 159936 |
| 6) | 407 * 393 = | | 6) 400 * 400 - 7 * 7 = 159951 |
| 7) | 104 * 96 = | | 7) 100 * 100 - 4 * 4 = 9984 |
| 8) | 394 * 406 = | | 8) 400 * 400 - 6 * 6 = 159964 |
| 9) | 97 * 103 = | | 9) 100 * 100 - 3 * 3 = 9991 |
| 10) | 298 * 302 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 95 * 254 - 95 * 54 = | | 11) ( 254 - 54) * 95 = 19000 |
| 12) | 41 * 47 + 47 * 59 = | | 12) ( 59 + 41) * 47 = 4700 |
| 13) | 60 * 54 + 140 * 54 = | | 13) ( 140 + 60) * 54 = 10800 |
| 14) | 275 * 40 - 40 * 75 = | | 14) ( 275 - 75) * 40 = 8000 |
| 15) | 136 * 23 - 23 * 36 = | | 15) ( 136 - 36) * 23 = 2300 |
| 16) | 41 * 87 + 87 * 59 = | | 16) ( 59 + 41) * 87 = 8700 |
| 17) | 51 * 65 + 49 * 65 = | | 17) ( 51 + 49) * 65 = 6500 |
| 18) | 38 * 162 - 62 * 38 = | | 18) ( 162 - 62) * 38 = 3800 |
| 19) | 252 * 53 - 52 * 53 = | | 19) ( 252 - 52) * 53 = 10600 |
| 20) | 46 * 35 + 165 * 46 = | | 20) ( 165 + 35) * 46 = 9200 |
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Score: ______________ | |
