math
posted by cha .
Subtract six and onehalf minus four and seventenths. Justify your steps.

6 1/2  4 7/10
When we subtract fractions, we must use a common denominator.
6 1/2 = 6 5/10
6 5/10  4 7/10
Now we need to borrow (or regroup).
6 5/10 = 5 15/10
5 15/10  4 7/10 = 1 8/10 = 1 4/5