 # 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. Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Solve Add/Subtract Problems to 20

Difficulty level:   ### 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 = ?

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
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
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
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 = ?
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
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
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
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
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
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
5
EDDIE SAYS

Method

10 - 5 = 5

Missing Number = 5

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