Answer: -1 7/8
Turn 3 5/8 into an Improper Fraction
Multiply 3*8 and get 24. Now add 15 and get 39 (Denominator stays the same). 3 5/8 = 39/8
Turn 5 4/8 into an Improper Fraction
Multiply 5*8 and get 40. Now add 4 and get 44 (Denominator stays the same). 5 4/8 = 44/8
Subtract
39/8 - 44/8 = -15/8
Turn -15/8 into a Mixed Number
-15/8 = -1 7/8