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Simple Algebraic Substitution with Decimal Numbers

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

'Simple Algebraic Substitution with Decimal Numbers' worksheet

Key stage:  KS 2

Curriculum topic:  Maths and Numerical Reasoning

Curriculum subtopic:  Equations and Algebra

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

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.

 

Example

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

3a - 1

 

Answer

3a - 1

= 3 x a - 1

= 3 x 0.4 - 1

= 1.2 - 1

= 0.2

Work out the value of the following expression when a = 0.1

2a + 5

Work out the value of the following expression when a = 0.2

2a + 6

Work out the value of the following expression when a = 4.4

2a - 7

Work out the value of the following expression when a = 2.7

a + a

Work out the value of the following expression when a = 1.5

5a + 2

Work out the value of the following expression when a = 0.8

2 - 2a

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

10 - 2a

Work out the value of the following expression when a = 9.9

20 - a

Work out the value of the following expression when a = 5.6

20 + 2a

Work out the value of the following expression when a = 0.75

20 + 2a

  • Question 1

Work out the value of the following expression when a = 0.1

2a + 5

CORRECT ANSWER
5.2
  • Question 2

Work out the value of the following expression when a = 0.2

2a + 6

CORRECT ANSWER
6.4
  • Question 3

Work out the value of the following expression when a = 4.4

2a - 7

CORRECT ANSWER
1.8
  • Question 4

Work out the value of the following expression when a = 2.7

a + a

CORRECT ANSWER
5.4
  • Question 5

Work out the value of the following expression when a = 1.5

5a + 2

CORRECT ANSWER
9.5
  • Question 6

Work out the value of the following expression when a = 0.8

2 - 2a

CORRECT ANSWER
0.4
  • Question 7

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

10 - 2a

CORRECT ANSWER
9.2
  • Question 8

Work out the value of the following expression when a = 9.9

20 - a

CORRECT ANSWER
10.1
  • Question 9

Work out the value of the following expression when a = 5.6

20 + 2a

CORRECT ANSWER
31.2
  • Question 10

Work out the value of the following expression when a = 0.75

20 + 2a

CORRECT ANSWER
21.5
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