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 January 08 2026
02:40:15 PM | Thursday January 08 2026
02:40:15 PMFlip Answers |
| 1) | 205 * 195 = | | 1) 200 * 200 - 5 * 5 = 39975 |
| 2) | 402 * 398 = | | 2) 400 * 400 - 2 * 2 = 159996 |
| 3) | 190 * 210 = | | 3) 200 * 200 - 10 * 10 = 39900 |
| 4) | 308 * 292 = | | 4) 300 * 300 - 8 * 8 = 89936 |
| 5) | 106 * 94 = | | 5) 100 * 100 - 6 * 6 = 9964 |
| 6) | 208 * 192 = | | 6) 200 * 200 - 8 * 8 = 39936 |
| 7) | 293 * 307 = | | 7) 300 * 300 - 7 * 7 = 89951 |
| 8) | 402 * 398 = | | 8) 400 * 400 - 2 * 2 = 159996 |
| 9) | 91 * 109 = | | 9) 100 * 100 - 9 * 9 = 9919 |
| 10) | 190 * 210 = | | 10) 200 * 200 - 10 * 10 = 39900 |
| 11) | 59 * 167 - 59 * 67 = | | 11) ( 167 - 67) * 59 = 5900 |
| 12) | 49 * 168 - 49 * 68 = | | 12) ( 168 - 68) * 49 = 4900 |
| 13) | 171 * 26 - 26 * 71 = | | 13) ( 171 - 71) * 26 = 2600 |
| 14) | 151 * 39 + 49 * 39 = | | 14) ( 151 + 49) * 39 = 7800 |
| 15) | 60 * 263 - 60 * 63 = | | 15) ( 263 - 63) * 60 = 12000 |
| 16) | 244 * 93 - 44 * 93 = | | 16) ( 244 - 44) * 93 = 18600 |
| 17) | 249 * 67 - 49 * 67 = | | 17) ( 249 - 49) * 67 = 13400 |
| 18) | 37 * 64 + 64 * 163 = | | 18) ( 163 + 37) * 64 = 12800 |
| 19) | 153 * 43 + 47 * 43 = | | 19) ( 153 + 47) * 43 = 8600 |
| 20) | 49 * 69 + 151 * 69 = | | 20) ( 151 + 49) * 69 = 13800 |
|
Score: ______________ | |
