Checking Subtractions (1)

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

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Estimate and Check Answers

Difficulty level:

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.

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.

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.

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.

right
EDDIE SAYS
18 + 16 = 34
• Question 3

Caroline says that

37 - 12 =     25

Use addition to check if she is right or wrong.

right
EDDIE SAYS
25 + 12 = 37
• Question 4

David says that

41 - 12 =     39

Use addition to check if he is right or wrong.

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.

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.

right
EDDIE SAYS
52 + 12 = 64
• Question 7

Gill says that

62 - 16 =     46

Use addition to check if she is right or wrong.

right
EDDIE SAYS
46 + 16 = 62
• Question 8

Harry says that

48 - 19 =     27

Use addition to check if he is right or wrong.

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.

right
EDDIE SAYS
36 + 48 = 84
• Question 10

Jack says that

92 - 75 =     23

Use addition to check if he is right or wrong.

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

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