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Checking Subtractions (1)

In this worksheet, students must use additions to check subtractions. Two-digit numbers are used.

'Checking Subtractions (1)' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

From any addition fact such as

35 + 23 = 58

 

we can work out two subtraction facts.

 

Here we get

58 - 35 = 23

and

58 - 23 = 35

 

This is handy because we can use additions to check subtractions.

 

 

Example 1

Anna says that

 

33 - 15 =     18     

 

Use addition to check if she is right or wrong.

 

Answer

18 + 15 = 33

 

So Anna is right.

 

 

Example 2

Ben says that

 

54 - 15 =     31     

 

Use addition to check if he is right or wrong.

 

Answer

31 + 15 = 46 not 54

 

So Ben is wrong.

Anna says that

 

23 - 15 =     7     

 

Use addition to check if she is right or wrong.

right

wrong

Ben says that

 

34 - 16 =     18     

 

Use addition to check if he is right or wrong.

right

wrong

Caroline says that

 

37 - 12 =     25     

 

Use addition to check if she is right or wrong.

right

wrong

David says that

 

41 - 12 =     39     

 

Use addition to check if he is right or wrong.

right

wrong

Emir says that

 

54 - 15 =     41     

 

Use addition to check if he is right or wrong.

right

wrong

Fatima says that

 

64 - 12 =     52     

 

Use addition to check if she is right or wrong.

right

wrong

Gill says that

 

62 - 16 =     46     

 

Use addition to check if she is right or wrong.

right

wrong

Harry says that

 

48 - 19 =     27     

 

Use addition to check if he is right or wrong.

right

wrong

Izzy says that

 

84 - 48 =     36     

 

Use addition to check if she is right or wrong.

right

wrong

Jack says that

 

92 - 75 =     23     

 

Use addition to check if he is right or wrong.

right

wrong

  • Question 1

Anna says that

 

23 - 15 =     7     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
7 + 15 = 22 not 23
  • Question 2

Ben says that

 

34 - 16 =     18     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
18 + 16 = 34
  • Question 3

Caroline says that

 

37 - 12 =     25     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
25 + 12 = 37
  • Question 4

David says that

 

41 - 12 =     39     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
39 + 12 = 51 not 41
  • Question 5

Emir says that

 

54 - 15 =     41     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
41 + 15 = 56 not 54
  • Question 6

Fatima says that

 

64 - 12 =     52     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
52 + 12 = 64
  • Question 7

Gill says that

 

62 - 16 =     46     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
46 + 16 = 62
  • Question 8

Harry says that

 

48 - 19 =     27     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
27 + 19 = 46 not 48
  • Question 9

Izzy says that

 

84 - 48 =     36     

 

Use addition to check if she is right or wrong.

CORRECT ANSWER
right
EDDIE SAYS
36 + 48 = 84
  • Question 10

Jack says that

 

92 - 75 =     23     

 

Use addition to check if he is right or wrong.

CORRECT ANSWER
wrong
EDDIE SAYS
23 + 75 = 98 not 92
---- OR ----

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