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 November 15 2026
06:10:33 PM | Sunday November 15 2026
06:10:33 PMFlip Answers |
| 1) | 393 * 407 = | | 1) 400 * 400 - 7 * 7 = 159951 |
| 2) | 197 * 203 = | | 2) 200 * 200 - 3 * 3 = 39991 |
| 3) | 205 * 195 = | | 3) 200 * 200 - 5 * 5 = 39975 |
| 4) | 293 * 307 = | | 4) 300 * 300 - 7 * 7 = 89951 |
| 5) | 105 * 95 = | | 5) 100 * 100 - 5 * 5 = 9975 |
| 6) | 192 * 208 = | | 6) 200 * 200 - 8 * 8 = 39936 |
| 7) | 304 * 296 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 299 * 301 = | | 8) 300 * 300 - 1 * 1 = 89999 |
| 9) | 92 * 108 = | | 9) 100 * 100 - 8 * 8 = 9936 |
| 10) | 209 * 191 = | | 10) 200 * 200 - 9 * 9 = 39919 |
| 11) | 84 * 165 + 84 * 35 = | | 11) ( 165 + 35) * 84 = 16800 |
| 12) | 71 * 31 + 31 * 129 = | | 12) ( 129 + 71) * 31 = 6200 |
| 13) | 235 * 41 - 41 * 35 = | | 13) ( 235 - 35) * 41 = 8200 |
| 14) | 54 * 34 + 34 * 46 = | | 14) ( 46 + 54) * 34 = 3400 |
| 15) | 92 * 271 - 92 * 71 = | | 15) ( 271 - 71) * 92 = 18400 |
| 16) | 166 * 58 - 66 * 58 = | | 16) ( 166 - 66) * 58 = 5800 |
| 17) | 33 * 140 - 33 * 40 = | | 17) ( 140 - 40) * 33 = 3300 |
| 18) | 35 * 147 - 35 * 47 = | | 18) ( 147 - 47) * 35 = 3500 |
| 19) | 61 * 57 + 43 * 61 = | | 19) ( 43 + 57) * 61 = 6100 |
| 20) | 51 * 271 - 71 * 51 = | | 20) ( 271 - 71) * 51 = 10200 |
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Score: ______________ | |
