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 September 27 2026
12:09:17 AM | Sunday September 27 2026
12:09:17 AMFlip Answers |
| 1) | 304 * 296 = | | 1) 300 * 300 - 4 * 4 = 89984 |
| 2) | 402 * 398 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 106 * 94 = | | 3) 100 * 100 - 6 * 6 = 9964 |
| 4) | 299 * 301 = | | 4) 300 * 300 - 1 * 1 = 89999 |
| 5) | 395 * 405 = | | 5) 400 * 400 - 5 * 5 = 159975 |
| 6) | 95 * 105 = | | 6) 100 * 100 - 5 * 5 = 9975 |
| 7) | 409 * 391 = | | 7) 400 * 400 - 9 * 9 = 159919 |
| 8) | 190 * 210 = | | 8) 200 * 200 - 10 * 10 = 39900 |
| 9) | 209 * 191 = | | 9) 200 * 200 - 9 * 9 = 39919 |
| 10) | 302 * 298 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 27 * 27 + 27 * 73 = | | 11) ( 27 + 73) * 27 = 2700 |
| 12) | 43 * 59 + 43 * 41 = | | 12) ( 41 + 59) * 43 = 4300 |
| 13) | 28 * 263 - 63 * 28 = | | 13) ( 263 - 63) * 28 = 5600 |
| 14) | 275 * 47 - 75 * 47 = | | 14) ( 275 - 75) * 47 = 9400 |
| 15) | 245 * 88 - 88 * 45 = | | 15) ( 245 - 45) * 88 = 17600 |
| 16) | 84 * 152 - 84 * 52 = | | 16) ( 152 - 52) * 84 = 8400 |
| 17) | 149 * 21 - 21 * 49 = | | 17) ( 149 - 49) * 21 = 2100 |
| 18) | 80 * 246 - 46 * 80 = | | 18) ( 246 - 46) * 80 = 16000 |
| 19) | 235 * 80 - 35 * 80 = | | 19) ( 235 - 35) * 80 = 16000 |
| 20) | 235 * 89 - 89 * 35 = | | 20) ( 235 - 35) * 89 = 17800 |
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Score: ______________ | |
