# How do you subtract a negative fraction from a positive fraction?

$\frac{1}{4} - \left(- \frac{3}{8}\right) = \frac{1}{4} + \frac{3}{8} = \frac{5}{8}$
Subtracting a negative fraction $B$ from a positive fraction $A$ means adding the number part of it (that means leaving the minus sign) to $A$.
For example if we have to subtract $- \frac{3}{8}$ from $\frac{1}{4}$ means, adding $\frac{3}{8}$ to $\frac{1}{4}$ or $\frac{1}{4} + \frac{3}{8}$ and as $\frac{1}{4}$ equal to $\frac{2}{8}$, $\frac{1}{4} + \frac{3}{8} = \frac{2}{8} + \frac{3}{8} = \frac{2 + 3}{8} = \frac{5}{8}$
Hence $\frac{1}{4} - \left(- \frac{3}{8}\right) = \frac{1}{4} + \frac{3}{8} = \frac{5}{8}$.