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 December 26 2025
12:47:31 PM | Friday December 26 2025
12:47:31 PMFlip Answers |
| 1) | 298 * 302 = | | 1) 300 * 300 - 2 * 2 = 89996 |
| 2) | 108 * 92 = | | 2) 100 * 100 - 8 * 8 = 9936 |
| 3) | 101 * 99 = | | 3) 100 * 100 - 1 * 1 = 9999 |
| 4) | 197 * 203 = | | 4) 200 * 200 - 3 * 3 = 39991 |
| 5) | 304 * 296 = | | 5) 300 * 300 - 4 * 4 = 89984 |
| 6) | 207 * 193 = | | 6) 200 * 200 - 7 * 7 = 39951 |
| 7) | 392 * 408 = | | 7) 400 * 400 - 8 * 8 = 159936 |
| 8) | 392 * 408 = | | 8) 400 * 400 - 8 * 8 = 159936 |
| 9) | 209 * 191 = | | 9) 200 * 200 - 9 * 9 = 39919 |
| 10) | 203 * 197 = | | 10) 200 * 200 - 3 * 3 = 39991 |
| 11) | 29 * 164 - 29 * 64 = | | 11) ( 164 - 64) * 29 = 2900 |
| 12) | 40 * 50 + 40 * 50 = | | 12) ( 50 + 50) * 40 = 4000 |
| 13) | 55 * 26 + 26 * 45 = | | 13) ( 55 + 45) * 26 = 2600 |
| 14) | 74 * 75 + 25 * 74 = | | 14) ( 25 + 75) * 74 = 7400 |
| 15) | 28 * 39 + 28 * 61 = | | 15) ( 61 + 39) * 28 = 2800 |
| 16) | 49 * 256 - 56 * 49 = | | 16) ( 256 - 56) * 49 = 9800 |
| 17) | 267 * 72 - 72 * 67 = | | 17) ( 267 - 67) * 72 = 14400 |
| 18) | 71 * 57 + 29 * 57 = | | 18) ( 29 + 71) * 57 = 5700 |
| 19) | 244 * 31 - 44 * 31 = | | 19) ( 244 - 44) * 31 = 6200 |
| 20) | 164 * 28 - 28 * 64 = | | 20) ( 164 - 64) * 28 = 2800 |
|
Score: ______________ | |
