Math mixed fractions

Question

Madelyn bought 12 ⁵/₈ yards of fabric. She used 6 ⁷/₈ yards of the fabric for a costume. How much fabric did Madelyn have left? 

Answer 1

12 5/8 = 101/8

6 7/8 = 55/8

101/8 -55/8 = 46/8 = 23/4 =5 3/4 yards left

12 5/8 = 12.625

6 7/8 = 6.875

12.625 - 6.875 = 5.75 yards left = 5 3/4 yards