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Watch: Adding and subtracting fractions

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Common denominators

It's easy to add and subtract fractions when the numbers on the bottom are the same.

These are called the denominators.

\( \frac{2}{9} \) + \( \frac{5}{9} \) = \( \frac{7}{9} \)

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Equivalent fractions

However, sometimes the denominators are different.

\( \frac{1}{2} \) + \( \frac{1}{3} \) = ?

You can use equivalent fractions to make them the same.

A common multiple of 2 and 3 is 6.

So, for each fraction we need an equivalent fraction with a denominator of 6.

To find the equivalent fraction for \( \frac{1}{2} \) we need to multiply the numerator and denominator by 3.

\( \frac{1}{2} \) = \( \frac{3}{6} \)

And to find the equivalent fraction for\( \frac{1}{3} \) we must multiply the numerator and denominator by 2.

\( \frac{1}{3} \) = \( \frac{2}{6} \)

Now the denominators are the same we can add them together.

\( \frac{3}{6} \) + \( \frac{2}{6} \) = \( \frac{5}{6} \)

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Activity 1

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Activity 2

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Activity 3

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Activity 4

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Teaching resources

Looking for more teaching resources? This short animated film on adding and subtracting fractions is from the 成人论坛 Teach series, Hyaptia's Mathematical Maze.

成人论坛 Teach has thousands of free, curriculum-linked resources to help deliver lessons - all arranged by subject and age group.

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Play our fun maths game Guardians: Defenders of Mathematica. game

Use your times tables and more maths skills to defeat monsters and reclaim the Kingdom of Mathematica

Play our fun maths game Guardians: Defenders of Mathematica
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More on Fractions

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