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Working Out Missing Numbers: What's the Value (0-20)?

In this worksheet, students use the information they have to calculate a missing number in the number range 0 to 20.

'Working Out Missing Numbers: What's the Value (0-20)?' worksheet

Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Solve Add/Subtract Problems to 20

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

Adding whole numbers means that we are combining numbers to form a total.

To identify the missing number, the given number is subtracted from the total number.

 

Example:

Find the missing numbers.

 ? + 4 = 8

 

Method:

8 - 4 = ?

 

Answer:

missing number = 4

Find the missing number and write it in the box below:

 

 ? + 4 = 10

Find the missing number and write it in the box below:

 

? + 2 = 5

Find the missing number and write it in the box below:

 

9 + ? = 10

Find the missing number and write it in the box below:

 

5 + 4 = ?

Find the missing number and write it in the box below:

 

11 +  ? = 12

Find the missing number and write it in the box below:

 

 ? + 6 = 10

Find the missing number and write it in the box below:

 

5 + ? = 14

Find the missing number and write it in the box below:

 

? + 5 = 17

Find the missing number and write it in the box below:

 

 ? + 2 = 9

Find the missing number and write it in the box below:

 

? + 5 = 10
  • Question 1

Find the missing number and write it in the box below:

 

 ? + 4 = 10
CORRECT ANSWER
6
EDDIE SAYS

Method

10 - 4 = 6

Missing Number = 4

  • Question 2

Find the missing number and write it in the box below:

 

? + 2 = 5
CORRECT ANSWER
3
EDDIE SAYS

Method

5 - 2 = 3

Missing Number = 3

  • Question 3

Find the missing number and write it in the box below:

 

9 + ? = 10
CORRECT ANSWER
1
EDDIE SAYS

Method

10 - 9 = 1

Missing Number = 1

  • Question 4

Find the missing number and write it in the box below:

 

5 + 4 = ?
CORRECT ANSWER
9
EDDIE SAYS

Method

5 + 4 = 9

Missing Number = 9

  • Question 5

Find the missing number and write it in the box below:

 

11 +  ? = 12
CORRECT ANSWER
1
EDDIE SAYS

Method

12 - 11 = 1

Missing Number = 1

  • Question 6

Find the missing number and write it in the box below:

 

 ? + 6 = 10
CORRECT ANSWER
4
EDDIE SAYS

Method

10 - 6 = 4

Missing Number = 4

  • Question 7

Find the missing number and write it in the box below:

 

5 + ? = 14
CORRECT ANSWER
9
EDDIE SAYS

Method

14 - 5 = 9

Missing Number = 9

  • Question 8

Find the missing number and write it in the box below:

 

? + 5 = 17
CORRECT ANSWER
12
EDDIE SAYS

Method

17 - 5 = 12

Missing Number = 12

  • Question 9

Find the missing number and write it in the box below:

 

 ? + 2 = 9
CORRECT ANSWER
7
EDDIE SAYS

Method

9 - 2 = 7

Missing Number = 7

  • Question 10

Find the missing number and write it in the box below:

 

? + 5 = 10
CORRECT ANSWER
5
EDDIE SAYS

Method

10 - 5 = 5

Missing Number = 5

---- OR ----

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