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
|
|
Saturday October 31 2026
08:57:21 AM | Saturday October 31 2026
08:57:21 AMFlip Answers |
| 1) | 198 * 202 = | | 1) 200 * 200 - 2 * 2 = 39996 |
| 2) | 108 * 92 = | | 2) 100 * 100 - 8 * 8 = 9936 |
| 3) | 401 * 399 = | | 3) 400 * 400 - 1 * 1 = 159999 |
| 4) | 297 * 303 = | | 4) 300 * 300 - 3 * 3 = 89991 |
| 5) | 397 * 403 = | | 5) 400 * 400 - 3 * 3 = 159991 |
| 6) | 396 * 404 = | | 6) 400 * 400 - 4 * 4 = 159984 |
| 7) | 192 * 208 = | | 7) 200 * 200 - 8 * 8 = 39936 |
| 8) | 102 * 98 = | | 8) 100 * 100 - 2 * 2 = 9996 |
| 9) | 204 * 196 = | | 9) 200 * 200 - 4 * 4 = 39984 |
| 10) | 295 * 305 = | | 10) 300 * 300 - 5 * 5 = 89975 |
| 11) | 241 * 29 - 41 * 29 = | | 11) ( 241 - 41) * 29 = 5800 |
| 12) | 136 * 35 - 36 * 35 = | | 12) ( 136 - 36) * 35 = 3500 |
| 13) | 260 * 62 - 62 * 60 = | | 13) ( 260 - 60) * 62 = 12400 |
| 14) | 84 * 73 + 127 * 84 = | | 14) ( 127 + 73) * 84 = 16800 |
| 15) | 130 * 49 + 70 * 49 = | | 15) ( 130 + 70) * 49 = 9800 |
| 16) | 52 * 274 - 74 * 52 = | | 16) ( 274 - 74) * 52 = 10400 |
| 17) | 36 * 54 + 36 * 146 = | | 17) ( 146 + 54) * 36 = 7200 |
| 18) | 84 * 162 - 62 * 84 = | | 18) ( 162 - 62) * 84 = 8400 |
| 19) | 241 * 83 - 41 * 83 = | | 19) ( 241 - 41) * 83 = 16600 |
| 20) | 38 * 154 + 38 * 46 = | | 20) ( 154 + 46) * 38 = 7600 |
|
Score: ______________ | |
