A2a – Substituting numerical values and expressions into formulae and expressions

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A starting point: substitution without numbers

Part 1 – Substituting numerical values into expressions and formulas

Teacher resources

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  • Slides in PPTX (with click-to-reveal answers)
  • Slides in PDF (one slide per page, suitable for importing into IWB software)
Links to past exam questions

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Part 2 – Substituting to check equations are satisfied

Teacher resources

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  • Slides in PPTX
  • Slides in PDF (one slide per page, suitable for importing into IWB software)
Links to past exam questions

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Part 3 – Substituting expressions into expressions

This question generator allows you to generate questions on the skill of substitution in context of sequences and finding intersection points by solving simultaneous equations by substitution.

Click on a question’s text to reveal the answer.

In the real world

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What next?
Substitution is a fundamental skill in algebra, along with solving equations. You will use it in many contexts. Two basic situations in which you will use substitution are (1) to plot a graph given its equation and (2) to use formulas to work out some useful information, such as the area of a shape: