Math Main Page => Exercises - Math III
|
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
|
|
Friday May 09 2025
08:09:24 AM | Friday May 09 2025
08:09:24 AMFlip Answers |
| 1) | 299 * 301 = | | 1) 300 * 300 - 1 * 1 = 89999 |
| 2) | 394 * 406 = | | 2) 400 * 400 - 6 * 6 = 159964 |
| 3) | 194 * 206 = | | 3) 200 * 200 - 6 * 6 = 39964 |
| 4) | 404 * 396 = | | 4) 400 * 400 - 4 * 4 = 159984 |
| 5) | 98 * 102 = | | 5) 100 * 100 - 2 * 2 = 9996 |
| 6) | 303 * 297 = | | 6) 300 * 300 - 3 * 3 = 89991 |
| 7) | 308 * 292 = | | 7) 300 * 300 - 8 * 8 = 89936 |
| 8) | 310 * 290 = | | 8) 300 * 300 - 10 * 10 = 89900 |
| 9) | 206 * 194 = | | 9) 200 * 200 - 6 * 6 = 39964 |
| 10) | 404 * 396 = | | 10) 400 * 400 - 4 * 4 = 159984 |
| 11) | 75 * 27 + 125 * 27 = | | 11) ( 125 + 75) * 27 = 5400 |
| 12) | 137 * 42 + 63 * 42 = | | 12) ( 137 + 63) * 42 = 8400 |
| 13) | 46 * 23 + 54 * 23 = | | 13) ( 46 + 54) * 23 = 2300 |
| 14) | 274 * 93 - 93 * 74 = | | 14) ( 274 - 74) * 93 = 18600 |
| 15) | 69 * 43 + 57 * 69 = | | 15) ( 43 + 57) * 69 = 6900 |
| 16) | 85 * 75 + 85 * 25 = | | 16) ( 25 + 75) * 85 = 8500 |
| 17) | 250 * 37 - 50 * 37 = | | 17) ( 250 - 50) * 37 = 7400 |
| 18) | 163 * 81 - 63 * 81 = | | 18) ( 163 - 63) * 81 = 8100 |
| 19) | 45 * 84 + 84 * 155 = | | 19) ( 155 + 45) * 84 = 16800 |
| 20) | 82 * 263 - 82 * 63 = | | 20) ( 263 - 63) * 82 = 16400 |
|
Score: ______________ | |
