# 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:

### QUESTION 1 of 10

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

Work out the value of the following expression when a = 10 and b = 12

 2a + 4b 5 3

Work out the value of the following expression when a = 6 and b = 12

 3a + 2b 2 3

Work out the value of the following expression when a = 35 and b = 35

 2a + 3b 5 7

Work out the value of the following expression when a = 6 and b = 12

 5a - b 6 3

Work out the value of the following expression when a = 14 and b = 18

 3a - 2b 7 3

Work out the value of the following expression when a = 6 and b = 25

 3a + 7b 2 5

Work out the value of the following expression when a = 6 and b = 12

 5a - 4b 2 3

Work out the value of the following expression when a = 10 and b = 6

 3a + 7b 5 3

Work out the value of the following expression when a = -16 and b = 72

 3a + 3b 2 8

Work out the value of the following expression when a = 6 and b = -30

 5a - 4b 2 5

• Question 1

Work out the value of the following expression when a = 10 and b = 12

 2a + 4b 5 3

20
EDDIE SAYS
4 + 16
• Question 2

Work out the value of the following expression when a = 6 and b = 12

 3a + 2b 2 3

17
EDDIE SAYS
9 + 8
• Question 3

Work out the value of the following expression when a = 35 and b = 35

 2a + 3b 5 7

29
EDDIE SAYS
14 + 15
• Question 4

Work out the value of the following expression when a = 6 and b = 12

 5a - b 6 3

1
EDDIE SAYS
5 - 4
• Question 5

Work out the value of the following expression when a = 14 and b = 18

 3a - 2b 7 3

-6
EDDIE SAYS
6 - 12
• Question 6

Work out the value of the following expression when a = 6 and b = 25

 3a + 7b 2 5

44
EDDIE SAYS
9 + 35
• Question 7

Work out the value of the following expression when a = 6 and b = 12

 5a - 4b 2 3

-1
EDDIE SAYS
15 - 16
• Question 8

Work out the value of the following expression when a = 10 and b = 6

 3a + 7b 5 3

20
EDDIE SAYS
6 + 14
• Question 9

Work out the value of the following expression when a = -16 and b = 72

 3a + 3b 2 8

3
EDDIE SAYS
-24 + 27
• Question 10

Work out the value of the following expression when a = 6 and b = -30

 5a - 4b 2 5

39
EDDIE SAYS
15 - -24
---- OR ----

Sign up for a £1 trial so you can track and measure your child's progress on this activity.

### What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started