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 March 24 2026
11:38:24 PM | Tuesday March 24 2026
11:38:24 PMFlip Answers |
| 1) | 394 * 406 = | | 1) 400 * 400 - 6 * 6 = 159964 |
| 2) | 303 * 297 = | | 2) 300 * 300 - 3 * 3 = 89991 |
| 3) | 294 * 306 = | | 3) 300 * 300 - 6 * 6 = 89964 |
| 4) | 406 * 394 = | | 4) 400 * 400 - 6 * 6 = 159964 |
| 5) | 91 * 109 = | | 5) 100 * 100 - 9 * 9 = 9919 |
| 6) | 390 * 410 = | | 6) 400 * 400 - 10 * 10 = 159900 |
| 7) | 305 * 295 = | | 7) 300 * 300 - 5 * 5 = 89975 |
| 8) | 109 * 91 = | | 8) 100 * 100 - 9 * 9 = 9919 |
| 9) | 201 * 199 = | | 9) 200 * 200 - 1 * 1 = 39999 |
| 10) | 403 * 397 = | | 10) 400 * 400 - 3 * 3 = 159991 |
| 11) | 70 * 51 + 51 * 130 = | | 11) ( 130 + 70) * 51 = 10200 |
| 12) | 43 * 261 - 43 * 61 = | | 12) ( 261 - 61) * 43 = 8600 |
| 13) | 92 * 272 - 92 * 72 = | | 13) ( 272 - 72) * 92 = 18400 |
| 14) | 70 * 69 + 130 * 69 = | | 14) ( 130 + 70) * 69 = 13800 |
| 15) | 64 * 59 + 141 * 64 = | | 15) ( 141 + 59) * 64 = 12800 |
| 16) | 53 * 163 - 53 * 63 = | | 16) ( 163 - 63) * 53 = 5300 |
| 17) | 96 * 163 + 96 * 37 = | | 17) ( 163 + 37) * 96 = 19200 |
| 18) | 57 * 73 + 57 * 27 = | | 18) ( 27 + 73) * 57 = 5700 |
| 19) | 49 * 248 - 49 * 48 = | | 19) ( 248 - 48) * 49 = 9800 |
| 20) | 165 * 22 - 22 * 65 = | | 20) ( 165 - 65) * 22 = 2200 |
|
Score: ______________ | |
