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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Tuesday July 28 2026
12:54:38 AM | Tuesday July 28 2026
12:54:38 AMFlip Answers |
| 1) | 191 * 209 = | | 1) 200 * 200 - 9 * 9 = 39919 |
| 2) | 195 * 205 = | | 2) 200 * 200 - 5 * 5 = 39975 |
| 3) | 190 * 210 = | | 3) 200 * 200 - 10 * 10 = 39900 |
| 4) | 303 * 297 = | | 4) 300 * 300 - 3 * 3 = 89991 |
| 5) | 102 * 98 = | | 5) 100 * 100 - 2 * 2 = 9996 |
| 6) | 398 * 402 = | | 6) 400 * 400 - 2 * 2 = 159996 |
| 7) | 296 * 304 = | | 7) 300 * 300 - 4 * 4 = 89984 |
| 8) | 392 * 408 = | | 8) 400 * 400 - 8 * 8 = 159936 |
| 9) | 404 * 396 = | | 9) 400 * 400 - 4 * 4 = 159984 |
| 10) | 392 * 408 = | | 10) 400 * 400 - 8 * 8 = 159936 |
| 11) | 30 * 241 - 41 * 30 = | | 11) ( 241 - 41) * 30 = 6000 |
| 12) | 65 * 61 + 35 * 61 = | | 12) ( 35 + 65) * 61 = 6100 |
| 13) | 59 * 38 + 38 * 41 = | | 13) ( 41 + 59) * 38 = 3800 |
| 14) | 43 * 74 + 157 * 74 = | | 14) ( 157 + 43) * 74 = 14800 |
| 15) | 157 * 33 - 57 * 33 = | | 15) ( 157 - 57) * 33 = 3300 |
| 16) | 247 * 34 - 34 * 47 = | | 16) ( 247 - 47) * 34 = 6800 |
| 17) | 134 * 25 + 66 * 25 = | | 17) ( 134 + 66) * 25 = 5000 |
| 18) | 236 * 22 - 36 * 22 = | | 18) ( 236 - 36) * 22 = 4400 |
| 19) | 22 * 48 + 152 * 22 = | | 19) ( 152 + 48) * 22 = 4400 |
| 20) | 246 * 30 - 46 * 30 = | | 20) ( 246 - 46) * 30 = 6000 |
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Score: ______________ | |
