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
|
|
Tuesday October 13 2026
07:17:32 PM | Tuesday October 13 2026
07:17:32 PMFlip Answers |
| 1) | 206 * 194 = | | 1) 200 * 200 - 6 * 6 = 39964 |
| 2) | 305 * 295 = | | 2) 300 * 300 - 5 * 5 = 89975 |
| 3) | 92 * 108 = | | 3) 100 * 100 - 8 * 8 = 9936 |
| 4) | 196 * 204 = | | 4) 200 * 200 - 4 * 4 = 39984 |
| 5) | 102 * 98 = | | 5) 100 * 100 - 2 * 2 = 9996 |
| 6) | 391 * 409 = | | 6) 400 * 400 - 9 * 9 = 159919 |
| 7) | 108 * 92 = | | 7) 100 * 100 - 8 * 8 = 9936 |
| 8) | 291 * 309 = | | 8) 300 * 300 - 9 * 9 = 89919 |
| 9) | 299 * 301 = | | 9) 300 * 300 - 1 * 1 = 89999 |
| 10) | 206 * 194 = | | 10) 200 * 200 - 6 * 6 = 39964 |
| 11) | 43 * 268 - 68 * 43 = | | 11) ( 268 - 68) * 43 = 8600 |
| 12) | 29 * 52 + 48 * 29 = | | 12) ( 52 + 48) * 29 = 2900 |
| 13) | 147 * 31 - 47 * 31 = | | 13) ( 147 - 47) * 31 = 3100 |
| 14) | 136 * 28 - 36 * 28 = | | 14) ( 136 - 36) * 28 = 2800 |
| 15) | 154 * 22 - 54 * 22 = | | 15) ( 154 - 54) * 22 = 2200 |
| 16) | 54 * 25 + 54 * 75 = | | 16) ( 25 + 75) * 54 = 5400 |
| 17) | 41 * 47 + 41 * 153 = | | 17) ( 153 + 47) * 41 = 8200 |
| 18) | 46 * 169 - 69 * 46 = | | 18) ( 169 - 69) * 46 = 4600 |
| 19) | 37 * 90 + 90 * 63 = | | 19) ( 63 + 37) * 90 = 9000 |
| 20) | 43 * 57 + 57 * 57 = | | 20) ( 57 + 43) * 57 = 5700 |
|
Score: ______________ | |
