## What you need to know

Things to remember:

• If we add or subtract two fractions with the same denominator, we can just add or subtract the top numbers.
• If we add or subtract two fractions with the same denominator, the denominator in the answer will be the same as the denominator in the question.

Letâ€™s recap a little, below we have a fraction of a grid shaded in and what this means in terms of numbers.

$=\frac{3}{6}$

Here, the numerator is 3, and the denominator is 6.

If two fractions have the same denominator, we can actually just add them straight away

$$\frac{3}{6} + \frac{2}{6}= \frac{5}{6}$$

Because our two fractions have been split into the same amount, so is the answer, so the denominators stay the same! We have added 3 sixths and 2 sixths, to give us a total of 5 sixths. We can do the same with subtraction.

$$\frac{3}{6} - \frac{2}{6}= \frac{1}{6}$$

## Example Questions

#### Question 1: Find the answer to: $$\frac{3}{8} + \frac{1}{8}$$

$$\frac{3}{8} + \frac{1}{8}=\frac{4}{8}$$

So, the answer is $\frac{4}{8}$

#### Question 2: Find the answer to: $$\frac{7}{9} - \frac{5}{9}$$

$$\frac{7}{9} - \frac{5}{9}=\frac{2}{9}$$
So, the answer is $\frac{2}{9}$