Students learn how to change the subject of a formula by factorising and the balance method.

Later, as learning progresses they solve more complex formulae.

**Differentiated Learning Objectives**

- All students should be able to rearrange a formula in the form ax+bx=c by factorising to make x the subject.
- Most students should be able to rearrange a formula in the form (a/x)+b=c to make x the subject
- Some students should be able to rearrange a formula in the form a/(x+d) = b/(x-c) to make x the subject.