# Adding and Subtracting Family Groups (1)

In this worksheet, students must know that addition and subtraction are inverses and each fact has three other related facts.

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

3 + 5 = 8

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

5 + 3 = 8

The subtraction facts in this family will be

8 - 5 = 3

and

8 - 3 = 5

Example

What are the three related family facts for...?

15 + 18 = 33

Answer

For the other addition fact, just reverse the first two numbers.

The other addition fact in this family is

18 + 15 = 33

For the subtraction fact, we start with the biggest number.

The subtraction facts in this family will be

33 - 15 = 18

and

33 - 18 = 15

Choose the other addition fact related to:

5 + 7 = 12

7 + 5 = 12

12 + 5 = 7

5 + 12 = 7

Choose the other addition fact related to:

6 + 4 = 10

10 - 6 = 4

4 + 6 = 10

10 - 4 = 6

Choose the other subtraction fact related to:

6 - 4 = 2

10 - 6 = 4

6 - 2 = 4

2 + 4 = 6

Choose the other subtraction fact related to:

14 - 4 = 10

14 - 6 = 8

10 + 4 = 14

14 - 10 = 4

Choose the other addition fact related to:

25 + 7 = 32

27 + 5 = 32

25 + 32 = 7

7 + 25 = 32

Choose the other subtraction fact related to:

36 - 4 = 32

36 - 6 = 30

36 - 32 = 4

32 + 4 = 36

Choose the subtraction fact related to:

5 + 7 = 12

7 - 5 = 12

12 - 5 = 7

5 - 12 = 7

Choose all the subtraction facts related to:

5 + 7 = 12

12 - 5 = 7

7 - 12 = 5

12 - 7 = 5

5 - 12 = 7

7 + 5 = 12

Choose all the subtraction and addition facts related to:

5 + 7 = 12

12 - 5 = 7

7 - 12 = 5

12 - 7 = 5

5 - 12 = 7

7 + 5 = 12

Choose all the subtraction and addition facts related to:

12 + 4 = 16

12 - 4 = 16

16 - 12 = 4

12 + 16 = 4

16 - 4 = 12

4 + 12 = 16

• Question 1

Choose the other addition fact related to:

5 + 7 = 12

CORRECT ANSWER
7 + 5 = 12
EDDIE SAYS
Just reverse the 5 and 7.
• Question 2

Choose the other addition fact related to:

6 + 4 = 10

CORRECT ANSWER
4 + 6 = 10
EDDIE SAYS
Just reverse the 6 and 4.
• Question 3

Choose the other subtraction fact related to:

6 - 4 = 2

CORRECT ANSWER
6 - 2 = 4
EDDIE SAYS
Keep the big number at the start.
• Question 4

Choose the other subtraction fact related to:

14 - 4 = 10

CORRECT ANSWER
14 - 10 = 4
EDDIE SAYS
Keep the big number at the start.
• Question 5

Choose the other addition fact related to:

25 + 7 = 32

CORRECT ANSWER
7 + 25 = 32
EDDIE SAYS
Just reverse the 25 and 7.
• Question 6

Choose the other subtraction fact related to:

36 - 4 = 32

CORRECT ANSWER
36 - 32 = 4
EDDIE SAYS
Keep the big number at the start.
• Question 7

Choose the subtraction fact related to:

5 + 7 = 12

CORRECT ANSWER
12 - 5 = 7
EDDIE SAYS
The big number goes first.
• Question 8

Choose all the subtraction facts related to:

5 + 7 = 12

CORRECT ANSWER
12 - 5 = 7
12 - 7 = 5
EDDIE SAYS
The big number goes first.
• Question 9

Choose all the subtraction and addition facts related to:

5 + 7 = 12

CORRECT ANSWER
12 - 5 = 7
12 - 7 = 5
7 + 5 = 12
EDDIE SAYS
For the other addition fact, just reverse the first two numbers.
The big number goes first in the subtractions.
• Question 10

Choose all the subtraction and addition facts related to:

12 + 4 = 16

CORRECT ANSWER
16 - 12 = 4
16 - 4 = 12
4 + 12 = 16
EDDIE SAYS
For the other addition fact, just reverse the first two numbers.
The big number goes first in the subtractions.
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