There are 6 apples on the tree.

2 fall off.

How many are left?

6-2=4 apples

4

5 7 -1 9

At a party 57 balloons fly down.

19 of them burst!How many are left?1

83

4

balloons

3 2 -1 7

The shopkeeper has 32 Easter eggs.

He sells 17. How many are left?1

5

2

eggs1

Tom sees 24 blue and orange fish.

9 are orange.How many are blue?2 4 -

91

5

1

fish1

Before Opened Now

l

On the tree there are 9 presents.The children have already opened 6.

How many were there on the tree first?

-6 915?

-14

14 people get on the bus

How many people were there in the

queue before?

9 people are left in the queue

? = 923

-5 12

input

Work out theoutput

?7

-4 23 ?19

-5 23

input

Work out theoutput

?18

-4 18 ?14

-6

Work out the

input output

? 11

-4 ? 15

17

19

-3

Work out the

inputoutput

? 28

-8 ? 12

31

20

input

output

input outputThe Subtraction Machine

-5

26 ?21

13 8??

? 36

1419

41

input

output

input outputThe Subtraction Machine

-7

13 ?6

24 17??

? 31

2229

38

input

output

input outputThe Subtraction Machine

-6

44 ?38

29 23??

? 9

1723

15

The End