One way to add or subtract mixed numbers is to subtract

the whole numbers and the fractions separately.

If the fractions have

unlike denominators, first find a common denominator.

Then, add or subtract the whole numbers and the fractions.

One way to subtract mixed numbers is to subtract the whole numbers and the fractions separately.

One way to subtract fractions with unequal denominators is to find a common denominator.

The least common denominator is the least common multiple of 4 and 12, which is 12.

First, find a fraction that is equivalent to

$\frac{2}{4}$ with a denominator of 12.

Since 4 times 3 is 12, multiply

$\frac{2}{4}$ by

$\frac{3}{3}$ to find a fraction equivalent to

$\frac{2}{4}$ with a denominator of 12.

$\frac{2}{4}\times \frac{3}{3}=\frac{6}{12}$

Then, subtract the mixed numbers by subtracting the whole numbers and fractions separately.

$\begin{array}{rcl}9\frac{6}{12}-5\frac{1}{12}& =& \text{(}9-5\text{)}+\text{(}\frac{6}{12}-\frac{1}{12}\text{)}\\ & =& 4+\frac{5}{12}\\ & =& 4\frac{5}{12}\end{array}$