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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.

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

Key stage:  KS 2

Curriculum topic:  Number: Addition and Subtraction

Curriculum subtopic:  Use Correct Methods to Problem Solve

Difficulty level:  

down

Worksheet Overview

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

 

Answer

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

CORRECT ANSWER
1
  • Question 2

Find the number to make the sum correct.

20 + __ = 20

CORRECT ANSWER
0
  • Question 3

Find the number to make the sum correct.

3 + __ = 20

CORRECT ANSWER
17
  • Question 4

Find the number to make the sum correct.

80 + __ = 100

CORRECT ANSWER
20
  • Question 5

Find the number to make the sum correct.

82 + __ = 100

CORRECT ANSWER
18
  • Question 6

Find the number to make the sum correct.

60 + __ = 100

CORRECT ANSWER
40
  • Question 7

Find the number to make the sum correct.

89 + __ = 100

CORRECT ANSWER
11
  • Question 8

Find the number to make the sum correct.

21 + __ = 50

CORRECT ANSWER
29
  • Question 9

Find the number to make the sum correct.

15 + __ = 90

CORRECT ANSWER
75
  • Question 10

Find the number to make the sum correct.

1 + __ = 20

CORRECT ANSWER
19
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