Algebra: Substitution into Expressions with Fractions (1)

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

 a + b 2 3

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

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

-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

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

-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

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

-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

-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

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

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

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

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