Students learn about substituting numbers into formulae using the order of operations. As learning progresses students are challened to substitute decimal and negative numbers into increasingly complex formulae.The start of the lesson recaps using the order of operations to arrange a series of calculations in ascending order. The plenary challenges students to apply substituting numbers into formulae in a real life context.

**Differentiated Learning Objectives**

- All students should be able to substitute integer values into a formula.
- Most students should be able to substitute integer and decimal values into a formula.
- Some students should be able to substitute known values into a formula.

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