complete lesson - introduction to changing the subject of the formula

This lesson teaches how an expression is built, exploring how it looks different when operations have been done in different orders, and how it is unpicked, so that students learn what to do in what order
to then change the subject.
students should have copies of the write on slides. so they do this work, not all teach led. 1 step and 2 step operations only, followed by a differentiated worksheet.