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Addition and Subtraction: Find the Missing Number (3)

In this worksheet, students solve number problems using addition to find the missing value (0-20).

Key stage:  KS 1

Curriculum topic:  Number: Addition and Subtraction

Curriculum subtopic:  Solve Add/Subtract Problems to 20

Difficulty level:  

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QUESTION 1 of 10

Addition is adding something on.

When you add things together, you get a total.

 

 

Example

Look at this problem. A number is missing.

You need to find its value. You can use addition.

 

6 + ? = 17

 

Answer

You add a number to 6 to make 17? (17 is your total.)

17 - 6 = 11

So the missing number = 11

 

Check:

6 + 11 = 17

What must I add to 7 to make 19?

 

7 + ? = 19

What must I add to 7 to make 15?

 

 ? + 7 = 15

What must I add to 5 to make 10?

 

5 +  ? = 10

What must I add to 3 to make 11?

 

3 +  ? = 11

What must I add to 1 to make 6?

 

1 + ? = 6

What must I add to 4 to make 10? 

 

?  + 4 = 10

What must I add to 2 to make 9? 

 

2 + ?  = 9

What must I add to 1 to make 19? 

 

 ? + 1 = 19

What must I add to 1 to make 10?

 

 ? + 1 = 10

What must I add to 5 to make 20?

 

+ 5 = 20
  • Question 1

What must I add to 7 to make 19?

 

7 + ? = 19
CORRECT ANSWER
12
EDDIE SAYS

19 − 7 = 12

Missing number = 12

Check: 7 + 12 = 19
  • Question 2

What must I add to 7 to make 15?

 

 ? + 7 = 15
CORRECT ANSWER
8
EDDIE SAYS

15 − 7 = 8

Missing number = 8

Check: 8 + 7 = 15
  • Question 3

What must I add to 5 to make 10?

 

5 +  ? = 10
CORRECT ANSWER
5
EDDIE SAYS

10 − 5 = 5

Missing number = 5

Check: 5 + 5 = 10
  • Question 4

What must I add to 3 to make 11?

 

3 +  ? = 11
CORRECT ANSWER
8
EDDIE SAYS

11 − 3 = 8

Missing number = 8

Check: 3 + 8 = 11
  • Question 5

What must I add to 1 to make 6?

 

1 + ? = 6
CORRECT ANSWER
5
EDDIE SAYS

6 − 1 = 5

Missing number = 5

Check: 1 + 5 = 6
  • Question 6

What must I add to 4 to make 10? 

 

?  + 4 = 10
CORRECT ANSWER
6
EDDIE SAYS

10 - 4 = 6

Missing number = 6

Check: 6 + 4 = 10
  • Question 7

What must I add to 2 to make 9? 

 

2 + ?  = 9
CORRECT ANSWER
7
EDDIE SAYS

9 − 2 = 7

Missing number = 7

Check: 2 + 7 = 9
  • Question 8

What must I add to 1 to make 19? 

 

 ? + 1 = 19
CORRECT ANSWER
18
EDDIE SAYS

19 − 1 = 18

Missing number = 18

Check: 18 + 1 = 19
  • Question 9

What must I add to 1 to make 10?

 

 ? + 1 = 10
CORRECT ANSWER
9
EDDIE SAYS

10 − 1 = 9

Missing number = 9

Check: 9 + 1 = 10
  • Question 10

What must I add to 5 to make 20?

 

+ 5 = 20
CORRECT ANSWER
15
EDDIE SAYS

20 − 5 = 15

Missing number = 15

Check: 15 + 5 = 20
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