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
|
|
Thursday March 12 2026
07:44:19 PM | Thursday March 12 2026
07:44:19 PMFlip Answers |
| 1) | 97 * 103 = | | 1) 100 * 100 - 3 * 3 = 9991 |
| 2) | 98 * 102 = | | 2) 100 * 100 - 2 * 2 = 9996 |
| 3) | 193 * 207 = | | 3) 200 * 200 - 7 * 7 = 39951 |
| 4) | 92 * 108 = | | 4) 100 * 100 - 8 * 8 = 9936 |
| 5) | 297 * 303 = | | 5) 300 * 300 - 3 * 3 = 89991 |
| 6) | 93 * 107 = | | 6) 100 * 100 - 7 * 7 = 9951 |
| 7) | 404 * 396 = | | 7) 400 * 400 - 4 * 4 = 159984 |
| 8) | 291 * 309 = | | 8) 300 * 300 - 9 * 9 = 89919 |
| 9) | 409 * 391 = | | 9) 400 * 400 - 9 * 9 = 159919 |
| 10) | 298 * 302 = | | 10) 300 * 300 - 2 * 2 = 89996 |
| 11) | 37 * 51 + 37 * 49 = | | 11) ( 49 + 51) * 37 = 3700 |
| 12) | 256 * 71 - 71 * 56 = | | 12) ( 256 - 56) * 71 = 14200 |
| 13) | 34 * 39 + 39 * 66 = | | 13) ( 34 + 66) * 39 = 3900 |
| 14) | 173 * 70 - 73 * 70 = | | 14) ( 173 - 73) * 70 = 7000 |
| 15) | 41 * 36 + 64 * 41 = | | 15) ( 36 + 64) * 41 = 4100 |
| 16) | 55 * 21 + 21 * 145 = | | 16) ( 145 + 55) * 21 = 4200 |
| 17) | 170 * 40 - 70 * 40 = | | 17) ( 170 - 70) * 40 = 4000 |
| 18) | 32 * 72 + 32 * 128 = | | 18) ( 128 + 72) * 32 = 6400 |
| 19) | 49 * 76 + 76 * 151 = | | 19) ( 151 + 49) * 76 = 15200 |
| 20) | 174 * 23 - 74 * 23 = | | 20) ( 174 - 74) * 23 = 2300 |
|
Score: ______________ | |
