Students learn about accuracy when rounding decimal numbers. Learning progresses from rounding to one decimal place using a number line to any decimal place using written methods. More able students consider the limits of accuracy when a number has been rounded.

At the start of the lesson students recap addition and subtraction with decimals. In the main they learn how to round any number to a given decimal place. The plenary is used to assess the progress made against the differentiated learning objectives.

**Differentiated Learning Objectives**

- All students should be able to round a number to the first decimal place.
- Most students should be able to round a number to any given decimal place.
- Some students should be able to determine the upper and lower bound when a number has been rounded to a decimal place.