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 May 09 2026
12:57:56 AM | Saturday May 09 2026
12:57:56 AMFlip Answers |
| 1) | 293 * 307 = | | 1) 300 * 300 - 7 * 7 = 89951 |
| 2) | 90 * 110 = | | 2) 100 * 100 - 10 * 10 = 9900 |
| 3) | 393 * 407 = | | 3) 400 * 400 - 7 * 7 = 159951 |
| 4) | 102 * 98 = | | 4) 100 * 100 - 2 * 2 = 9996 |
| 5) | 306 * 294 = | | 5) 300 * 300 - 6 * 6 = 89964 |
| 6) | 305 * 295 = | | 6) 300 * 300 - 5 * 5 = 89975 |
| 7) | 192 * 208 = | | 7) 200 * 200 - 8 * 8 = 39936 |
| 8) | 306 * 294 = | | 8) 300 * 300 - 6 * 6 = 89964 |
| 9) | 392 * 408 = | | 9) 400 * 400 - 8 * 8 = 159936 |
| 10) | 108 * 92 = | | 10) 100 * 100 - 8 * 8 = 9936 |
| 11) | 37 * 164 - 37 * 64 = | | 11) ( 164 - 64) * 37 = 3700 |
| 12) | 97 * 35 + 97 * 165 = | | 12) ( 165 + 35) * 97 = 19400 |
| 13) | 63 * 141 + 63 * 59 = | | 13) ( 141 + 59) * 63 = 12600 |
| 14) | 242 * 92 - 92 * 42 = | | 14) ( 242 - 42) * 92 = 18400 |
| 15) | 251 * 74 - 74 * 51 = | | 15) ( 251 - 51) * 74 = 14800 |
| 16) | 272 * 55 - 72 * 55 = | | 16) ( 272 - 72) * 55 = 11000 |
| 17) | 164 * 77 - 64 * 77 = | | 17) ( 164 - 64) * 77 = 7700 |
| 18) | 35 * 252 - 35 * 52 = | | 18) ( 252 - 52) * 35 = 7000 |
| 19) | 167 * 75 - 67 * 75 = | | 19) ( 167 - 67) * 75 = 7500 |
| 20) | 55 * 85 + 145 * 85 = | | 20) ( 145 + 55) * 85 = 17000 |
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Score: ______________ | |
