# Explain how to add related unit fractions with a representation or image

I can solve problems involving adding and simplifying fractions with different denominators.

# Explain how to add related unit fractions with a representation or image

I can solve problems involving adding and simplifying fractions with different denominators.

## Lesson details

### Key learning points

- Fractions need to have the same denominator if you are to add and subtract them.
- Common denominators for non-related fractions can be found using common multiples of the denominators.
- When adding or subtracting fractions with the same denominators you just add or subtract the numerators.

### Common misconception

Pupils think that although parts look different, they cannot represent the same fraction of the whole.

Ensure multiple examples are provided where the fractional parts of the whole look different but instead are equivalent in value. You may like to create a concrete example of each shape and show how it can be manipulated so the parts are equivalent.

### Keywords

Common denominator - When two or more fractions share the same denominator, you can say they have a common denominator.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

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## Starter quiz

### 6 Questions

$$ {15} \over {20}$$ -

$$ {3} \over {4}$$

$$ {16} \over {30}$$ -

$$ {8} \over {15}$$

$$ {4} \over {12}$$ -

$$ {1} \over {3}$$

$$ {3} \over {21}$$ -

$$ {1} \over {7}$$