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Use Simple Algebraic Substitution with Decimal Numbers

In this worksheet, students will substitute decimal numbers for letters and work out the value of simple expressions with one variable.

'Use Simple Algebraic Substitution with Decimal Numbers' worksheet

Key stage:  KS 3

Year:  Year 7 Maths worksheets

Curriculum topic:   Algebra

Curriculum subtopic:   Substitute Numerical Values for Formulae/Expressions

Popular topics:   Algebra worksheets, Year 7 Algebra worksheets, Decimals worksheets

Difficulty level:  

Worksheet Overview

When we substitute a number for a letter, we simply replace the letter with the number.

However, we must remember that 4b means 4 x b.



Work out the value of the following expression when a = 0.4

3a - 1



3a - 1

This means 3 x a - 1


Substitute 0.4 for the letter a:

3 x 0.4 - 1


Multiply first - remember the order of BIDMAS (or BODMAS)

1.2 - 1 = 0.2


It might look complicated, but you'll soon find it becomes second nature. Just work through it one step at a time.


Are you ready for some questions?


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