If you would like to solve - 6 1/4 + 2 1/8 - 0.02 + 1/5, you can calculate this using the following steps:
- 6 1/4 + 2 1/8 - 0.02 + 1/5 = - 25/4 + 17/8 - 2/100 + 1/5 = - 50/8 + 17/8 - 1/50 + 10/50 = - 33/8 + 9/50 = - 825/200 + 36/200 = - 789/200 = -3.945
The correct result would be - 789/200.