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Algebra: Substitution into Expressions with Fractions (1)

In this worksheet, students substitute values into expressions with fractions.

'Algebra: Substitution into Expressions with Fractions (1)' worksheet

Key stage:  KS 3

Curriculum topic:  Algebra

Curriculum subtopic:  Substitute Numerical Values for Formulae/Expressions

Difficulty level:  

Worksheet Overview

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

 

a + b
2 3

 

Answer

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

 

a + b
2 3

  

= 4 + 9
2  3

 

=  2  +  3  =  5

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

 

a + b
2 3

 

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

 

a - b
2 3

 

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

 

a + b
5 3

 

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

 

a + b
5 3

 

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

 

a + b
2 5

 

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

 

a - b
6 3

 

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

 

a - b
7 3

 

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

 

a - b
2 5

 

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

 

a + b
5 7

 

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

 

a + b
2 8

 

  • Question 1

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

 

a + b
2 3

 

CORRECT ANSWER
7
EDDIE SAYS
3 + 4
  • Question 2

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

 

a - b
2 3

 

CORRECT ANSWER
-1
EDDIE SAYS
3 - 4
  • Question 3

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

 

a + b
5 3

 

CORRECT ANSWER
4
EDDIE SAYS
2 + 2
  • Question 4

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

 

a + b
5 3

 

CORRECT ANSWER
-2
EDDIE SAYS
2 + -4
  • Question 5

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

 

a + b
2 5

 

CORRECT ANSWER
8
EDDIE SAYS
3 + 5
  • Question 6

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

 

a - b
6 3

 

CORRECT ANSWER
-3
EDDIE SAYS
1 - 4
  • Question 7

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

 

a - b
7 3

 

CORRECT ANSWER
-4
EDDIE SAYS
2 - 6
  • Question 8

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

 

a - b
2 5

 

CORRECT ANSWER
9
EDDIE SAYS
3 - -6
  • Question 9

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

 

a + b
5 7

 

CORRECT ANSWER
12
EDDIE SAYS
7 + 5
  • Question 10

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

 

a + b
2 8

 

CORRECT ANSWER
1
EDDIE SAYS
-8 + 9
---- OR ----

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