 # Find the Number: What Makes the Sum Correct? (1)

In this worksheet, students find the missing number in a sum by using addition and subtraction. Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Correct Methods to Problem Solve

Difficulty level:   ### QUESTION 1 of 10

In this worksheet you must find the missing number in a sum.

Example

Find the number that makes the sum correct.

40 + __ = 67

The opposite (inverse) of adding is subtracting.

So we work out 67 - 40 = 27

Find the number to make the sum correct.

19 + __ = 20

Find the number to make the sum correct.

20 + __ = 20

Find the number to make the sum correct.

3 + __ = 20

Find the number to make the sum correct.

80 + __ = 100

Find the number to make the sum correct.

82 + __ = 100

Find the number to make the sum correct.

60 + __ = 100

Find the number to make the sum correct.

89 + __ = 100

Find the number to make the sum correct.

21 + __ = 50

Find the number to make the sum correct.

15 + __ = 90

Find the number to make the sum correct.

1 + __ = 20

• Question 1

Find the number to make the sum correct.

19 + __ = 20

1
• Question 2

Find the number to make the sum correct.

20 + __ = 20

0
• Question 3

Find the number to make the sum correct.

3 + __ = 20

17
• Question 4

Find the number to make the sum correct.

80 + __ = 100

20
• Question 5

Find the number to make the sum correct.

82 + __ = 100

18
• Question 6

Find the number to make the sum correct.

60 + __ = 100

40
• Question 7

Find the number to make the sum correct.

89 + __ = 100

11
• Question 8

Find the number to make the sum correct.

21 + __ = 50

29
• Question 9

Find the number to make the sum correct.

15 + __ = 90

75
• Question 10

Find the number to make the sum correct.

1 + __ = 20

19
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