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In this worksheet, students practise their addition in the range 0-20 by identifying the number that completes the problem.

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

What must I add to 16 to make 17?

 16 + ? = 17

17 - 16 = 1

The missing number is 1

What must I add to 17 to make 18? Write the missing word in the box below.

 17 + ? = 18

What must I add to 7 to make 18? Write the missing word in the box below.

 ? + 7 = 18

What must I add to 18 to make 19? Write the missing word in the box below.

 18 + ? = 19

What must I add to 10 to make 17? Write the missing word in the box below.

 10 + ? = 17

What must I add to 11 to make 12? Write the missing word in the box below.

 11 + ? = 12

What must I add to 19 to make 20? Write the missing word in the box below.

 ? + 19 = 20

What must I add to 5 to make 14? Write the missing word in the box below.

 5 + ? = 14

What must I add to 7 to make 17? Write the missing word in the box below.

 ? + 7 = 17

What must I add to 2 to make 19? Write the missing word in the box below.

 ? + 2 = 19

What must I add to 5 to make 20? Write the missing word in the box below.

 ? + 5 = 20
• Question 1

What must I add to 17 to make 18? Write the missing word in the box below.

 17 + ? = 18
1
EDDIE SAYS

Method

18 - 17 = 1

Missing Number = 1

• Question 2

What must I add to 7 to make 18? Write the missing word in the box below.

 ? + 7 = 18
11
EDDIE SAYS

Method

18 - 7 = 11

Missing Number = 11

• Question 3

What must I add to 18 to make 19? Write the missing word in the box below.

 18 + ? = 19
1
EDDIE SAYS

Method

19 - 18 = 1

Missing Number = 1

• Question 4

What must I add to 10 to make 17? Write the missing word in the box below.

 10 + ? = 17
7
EDDIE SAYS

Method

17 - 10 = 7

Missing Number = 7

• Question 5

What must I add to 11 to make 12? Write the missing word in the box below.

 11 + ? = 12
1
EDDIE SAYS

Method

12 - 11 = 1

Missing Number = 1

• Question 6

What must I add to 19 to make 20? Write the missing word in the box below.

 ? + 19 = 20
1
EDDIE SAYS

Method

20 - 19 = 1

Missing Number = 1

• Question 7

What must I add to 5 to make 14? Write the missing word in the box below.

 5 + ? = 14
9
EDDIE SAYS

Method

14 - 5 = 9

Missing Number = 9

• Question 8

What must I add to 7 to make 17? Write the missing word in the box below.

 ? + 7 = 17
10
EDDIE SAYS

Method

17 - 7 = 10

Missing Number = 10

• Question 9

What must I add to 2 to make 19? Write the missing word in the box below.

 ? + 2 = 19
17
EDDIE SAYS

Method

19 - 2 = 17

Missing Number = 17

• Question 10

What must I add to 5 to make 20? Write the missing word in the box below.

 ? + 5 = 20
15
EDDIE SAYS

Method

20 - 5 = 15

Missing Number = 15

---- OR ----

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