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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Monday February 16 2026
10:42:25 PM | Monday February 16 2026
10:42:25 PMFlip Answers |
| 1) | 206 * 194 = | | 1) 200 * 200 - 6 * 6 = 39964 |
| 2) | 208 * 192 = | | 2) 200 * 200 - 8 * 8 = 39936 |
| 3) | 402 * 398 = | | 3) 400 * 400 - 2 * 2 = 159996 |
| 4) | 404 * 396 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 205 * 195 = | | 5) 200 * 200 - 5 * 5 = 39975 |
| 6) | 395 * 405 = | | 6) 400 * 400 - 5 * 5 = 159975 |
| 7) | 408 * 392 = | | 7) 400 * 400 - 8 * 8 = 159936 |
| 8) | 307 * 293 = | | 8) 300 * 300 - 7 * 7 = 89951 |
| 9) | 391 * 409 = | | 9) 400 * 400 - 9 * 9 = 159919 |
| 10) | 291 * 309 = | | 10) 300 * 300 - 9 * 9 = 89919 |
| 11) | 42 * 51 + 58 * 51 = | | 11) ( 42 + 58) * 51 = 5100 |
| 12) | 166 * 35 - 35 * 66 = | | 12) ( 166 - 66) * 35 = 3500 |
| 13) | 91 * 174 - 91 * 74 = | | 13) ( 174 - 74) * 91 = 9100 |
| 14) | 26 * 149 - 26 * 49 = | | 14) ( 149 - 49) * 26 = 2600 |
| 15) | 37 * 270 - 37 * 70 = | | 15) ( 270 - 70) * 37 = 7400 |
| 16) | 96 * 259 - 96 * 59 = | | 16) ( 259 - 59) * 96 = 19200 |
| 17) | 57 * 245 - 45 * 57 = | | 17) ( 245 - 45) * 57 = 11400 |
| 18) | 46 * 92 + 154 * 92 = | | 18) ( 154 + 46) * 92 = 18400 |
| 19) | 31 * 241 - 31 * 41 = | | 19) ( 241 - 41) * 31 = 6200 |
| 20) | 66 * 41 + 66 * 59 = | | 20) ( 41 + 59) * 66 = 6600 |
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Score: ______________ | |
