These two fractions do not have the same denominators (lower numbers), so we must first find a common denominator of the two fractions, before adding them together.

For the denominators here, the 4 and 6, a common denominator for both is 12.

With the common denominator, the
becomes a

and the
becomes a

So now our addition problem becomes this...

The problem here is to add and

Since these two fractions have the same denominators (the numbers under the fraction bar), we can add them together by simply adding the numerators (the 9 and 2 = 11), while keeping the same denominator (the 12).