Evaluating expressions with and without changing the subject
I can evaluate an expression where the subject has been changed and where it has not.
Evaluating expressions with and without changing the subject
I can evaluate an expression where the subject has been changed and where it has not.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Changing the subject can make it easier to evaluate a formula.
- It is possible to evaluate a formula without changing the subject.
- Both forms of the formula give the same result.
Keywords
Subject of an equation/formula - The subject of an equation/a formula is a variable that is expressed in terms of other variables. It should have an exponent of 1 and a coefficient of 1.
Common misconception
Changing the subject of an equation or formula is only done when you are told to.
Having students practise rearranging before substituting and vice versa allows them to decide when the skill could be useful.
To help you plan your year 9 maths lesson on: Evaluating expressions with and without changing the subject, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 9 maths lesson on: Evaluating expressions with and without changing the subject, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 maths lessons from the Expressions and formulae unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Starter quiz
6 Questions

Exit quiz
6 Questions

