 # Using Adding and Subtracting Family Groups (2)

In this worksheet, students must know that addition and subtraction are inverses and use this fact to check subtractions. Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Understand Relationship Between Addition and Subtraction

Difficulty level:   ### QUESTION 1 of 10

Addition and subtraction family facts normally come in FOURS

There are TWO addition facts and TWO subtraction facts.

If we know just one of them, we can always work out the other three.

If we know the addition fact that

23 + 35 = 58

we can say that the other addition fact in this family is

35 + 23 = 58

The subtraction facts in this family will be

58 - 35 = 23

and

58 - 23 = 35

Example 1

Check the subtraction 33 - 18 = 15

We work out 15 + 18 to see if it is 33.

15 + 10 + 8

15 + 10 = 25

25 + 8 = 33

which is the related addition fact   15 + 18 = 33

so the subtraction is correct.

Example 2

Check the subtraction 35 - 12 = 25

We work out 25 + 12 to see if it is 35.

25 + 10 + 2

25 + 10 = 35

35 + 2 = 37  and NOT 35

so the subtraction is wrong.

Check the subtraction

35 - 10 = 25

Is it right or wrong?

right

wrong

Check the subtraction

37 - 12 = 25

Is it right or wrong?

right

wrong

Check the subtraction

64 - 46 = 18

Is it right or wrong?

right

wrong

Check the subtraction

56 - 11 = 47

Is it right or wrong?

right

wrong

Check the subtraction

62 - 12 = 50

Is it right or wrong?

right

wrong

Check the subtraction

56 - 17 = 51

Is it right or wrong?

right

wrong

Check the subtraction

53 - 26 = 33

Is it right or wrong?

right

wrong

Check the subtraction

71 - 17 = 66

Is it right or wrong?

right

wrong

Check the subtraction

67 - 32 = 35

Is it right or wrong?

right

wrong

Check the subtraction

85 - 36 = 51

Is it right or wrong?

right

wrong

• Question 1

Check the subtraction

35 - 10 = 25

Is it right or wrong?

right
EDDIE SAYS
25 + 10 = 35
• Question 2

Check the subtraction

37 - 12 = 25

Is it right or wrong?

right
EDDIE SAYS
25 + 12 = 37
• Question 3

Check the subtraction

64 - 46 = 18

Is it right or wrong?

right
EDDIE SAYS
18 + 46 = 64
• Question 4

Check the subtraction

56 - 11 = 47

Is it right or wrong?

wrong
EDDIE SAYS
47 + 11 = 58 not 56
• Question 5

Check the subtraction

62 - 12 = 50

Is it right or wrong?

right
EDDIE SAYS
50 + 12 = 62
• Question 6

Check the subtraction

56 - 17 = 51

Is it right or wrong?

wrong
EDDIE SAYS
51 + 17 = 68 not 56
• Question 7

Check the subtraction

53 - 26 = 33

Is it right or wrong?

wrong
EDDIE SAYS
33 + 26 = 59 not 53
• Question 8

Check the subtraction

71 - 17 = 66

Is it right or wrong?

wrong
EDDIE SAYS
66 + 17 = 83 not 71
• Question 9

Check the subtraction

67 - 32 = 35

Is it right or wrong?

right
EDDIE SAYS
35 + 32 = 67
• Question 10

Check the subtraction

85 - 36 = 51

Is it right or wrong?

wrong
EDDIE SAYS
51 + 36 = 87 not 85
---- OR ----

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