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
|
|
Sunday May 24 2026
02:45:31 AM | Sunday May 24 2026
02:45:31 AMFlip Answers |
| 1) | 402 * 398 = | | 1) 400 * 400 - 2 * 2 = 159996 |
| 2) | 397 * 403 = | | 2) 400 * 400 - 3 * 3 = 159991 |
| 3) | 407 * 393 = | | 3) 400 * 400 - 7 * 7 = 159951 |
| 4) | 106 * 94 = | | 4) 100 * 100 - 6 * 6 = 9964 |
| 5) | 398 * 402 = | | 5) 400 * 400 - 2 * 2 = 159996 |
| 6) | 406 * 394 = | | 6) 400 * 400 - 6 * 6 = 159964 |
| 7) | 98 * 102 = | | 7) 100 * 100 - 2 * 2 = 9996 |
| 8) | 204 * 196 = | | 8) 200 * 200 - 4 * 4 = 39984 |
| 9) | 297 * 303 = | | 9) 300 * 300 - 3 * 3 = 89991 |
| 10) | 293 * 307 = | | 10) 300 * 300 - 7 * 7 = 89951 |
| 11) | 142 * 96 - 42 * 96 = | | 11) ( 142 - 42) * 96 = 9600 |
| 12) | 42 * 74 + 26 * 42 = | | 12) ( 26 + 74) * 42 = 4200 |
| 13) | 21 * 38 + 62 * 21 = | | 13) ( 62 + 38) * 21 = 2100 |
| 14) | 272 * 49 - 72 * 49 = | | 14) ( 272 - 72) * 49 = 9800 |
| 15) | 163 * 68 + 68 * 37 = | | 15) ( 163 + 37) * 68 = 13600 |
| 16) | 151 * 84 + 84 * 49 = | | 16) ( 151 + 49) * 84 = 16800 |
| 17) | 169 * 52 - 52 * 69 = | | 17) ( 169 - 69) * 52 = 5200 |
| 18) | 22 * 156 - 56 * 22 = | | 18) ( 156 - 56) * 22 = 2200 |
| 19) | 44 * 135 - 44 * 35 = | | 19) ( 135 - 35) * 44 = 4400 |
| 20) | 135 * 28 - 35 * 28 = | | 20) ( 135 - 35) * 28 = 2800 |
|
Score: ______________ | |
