CPM Homework Help : CC1MN Problem 4-57

Rewrite each expression as a single fraction.

$\frac{3}{8}+\frac{1}{8}$
Hint (a):
When adding or subtracting fractions with a common denominator, add or subtract with the numerators only. Circle around the problem with arrow pointing to 3 plus 1 = question mark.
Answer (a):
The problem now reads, 3 eighths + 1 eighth = 4 eighths. Reduce if possible.