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 January 28 2026
05:54:42 PM | Wednesday January 28 2026
05:54:42 PMFlip Answers |
| 1) | 208 * 192 = | | 1) 200 * 200 - 8 * 8 = 39936 |
| 2) | 293 * 307 = | | 2) 300 * 300 - 7 * 7 = 89951 |
| 3) | 207 * 193 = | | 3) 200 * 200 - 7 * 7 = 39951 |
| 4) | 406 * 394 = | | 4) 400 * 400 - 6 * 6 = 159964 |
| 5) | 94 * 106 = | | 5) 100 * 100 - 6 * 6 = 9964 |
| 6) | 105 * 95 = | | 6) 100 * 100 - 5 * 5 = 9975 |
| 7) | 392 * 408 = | | 7) 400 * 400 - 8 * 8 = 159936 |
| 8) | 92 * 108 = | | 8) 100 * 100 - 8 * 8 = 9936 |
| 9) | 306 * 294 = | | 9) 300 * 300 - 6 * 6 = 89964 |
| 10) | 406 * 394 = | | 10) 400 * 400 - 6 * 6 = 159964 |
| 11) | 251 * 75 - 51 * 75 = | | 11) ( 251 - 51) * 75 = 15000 |
| 12) | 57 * 255 - 55 * 57 = | | 12) ( 255 - 55) * 57 = 11400 |
| 13) | 61 * 172 - 72 * 61 = | | 13) ( 172 - 72) * 61 = 6100 |
| 14) | 48 * 128 + 48 * 72 = | | 14) ( 128 + 72) * 48 = 9600 |
| 15) | 97 * 53 + 47 * 97 = | | 15) ( 53 + 47) * 97 = 9700 |
| 16) | 92 * 144 - 44 * 92 = | | 16) ( 144 - 44) * 92 = 9200 |
| 17) | 148 * 63 + 52 * 63 = | | 17) ( 148 + 52) * 63 = 12600 |
| 18) | 63 * 59 + 37 * 59 = | | 18) ( 37 + 63) * 59 = 5900 |
| 19) | 35 * 272 - 72 * 35 = | | 19) ( 272 - 72) * 35 = 7000 |
| 20) | 48 * 166 - 48 * 66 = | | 20) ( 166 - 66) * 48 = 4800 |
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Score: ______________ | |
