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Substitute Numerical Values into Expressions

In this worksheet, students will substitute values into expressions

'Substitute Numerical Values into Expressions' worksheet

Key stage:  KS 3

Year:  Year 9 Maths worksheets

Curriculum topic:   Algebra

Curriculum subtopic:   Substitute Numerical Values for Formulae/Expressions

Difficulty level:  

Worksheet Overview

In this activity, we'll be learning how to substitute given values into expressions.


We use algebra when we don't know the exact numbers in a calculation, and to do this we use letters to stand for numbers that we are trying to find.

If we then get a value for that letter, we can swap them or substitute the value in!


boy with question marks


What do we mean by this?


Well, if a bottle of cola is £2, we know if we want more than one bottle we have to multiply the number by £2

We can write 2x for the unknown quantity of bottles of cola.


cola bottle


If someone asks for 3 bottles, we can substitute the x for 3:  3 lots of £2 = £6

Likewise, if someone asks for 5 bottles, we can substitute the x for 5:  5 lots of £2 = £10

Does that make it clearer?


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