  # Algebra: Substitution into Expressions with Fractions (2)

In this worksheet, students substitute values into expressions with fractions. Key stage:  KS 3

Curriculum topic:   Algebra

Curriculum subtopic:   Substitute Numerical Values for Formulae/Expressions

Difficulty level:   #### Worksheet Overview

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

Example

Work out the value of the following expression when a = 4 and b = 9

 3a + 4b 2 3

We substitute a = 4 and b = 9 into the following expression:

 3a + 4b 2 3

 = 3 x 4 + 4 x 9 2 3

 = 12 + 36 2 3

=  6  +  12  =  18

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