We learned to add and subtract fractions.

We learned how to add and subtract fractions with denominators that are the same.

Example: 

We add the tenths. There are 11 tenths, so .

We also learned how to add and subtract fractions with denominators that are not the same.

Example: 

We look for a common denominator, so we can add parts of the same size.

One way to find a common denominator is to use the product of the two denominators. This is always a common multiple.

Using 48 as a denominator, we find . This means .

We also can use a smaller common denominator.

Since 24 is a multiple of 6 and 8, we can rewrite as , which is .