3 five eights subtracted by 5 four eights.

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