# Know that the angles on a straight line sum to 180 degrees and use this to solve problems

I know that the angles on a straight line sum to 180 degrees and use this to solve problems.

# Know that the angles on a straight line sum to 180 degrees and use this to solve problems

I know that the angles on a straight line sum to 180 degrees and use this to solve problems.

## Lesson details

### Key learning points

- Angles on a straight line have a sum of 180 degrees.
- To calculate missing angles you can use addition and subtraction.
- Use mental or written strategies to calculate with angles up to 180 degrees.

### Common misconception

Pupils think that the angles on a straight line only applied to lines that are horizontal.

Ensure pupils are exposed to straight lines in a range of orientations, encouraging them to draw on the 180 degree angle and how this can apply to both sides of the straight line.

### Keywords

Sum - The sum is the result of adding two or more numbers.

Opposite - If something is opposite, it is placed on the other side.

### 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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