Relationship between Addition and Subtraction

50+ ____= 80

• 30

• 20

• 10

• 0

90-50=_____

• 20

• 40

• 30

• 10

The answer to an addition problem is called the ______.

• ten

• one

• difference

• sum

16+5=____

• 13

• 22

• 20

• 21

There are 3 children on the bus. 27 more children get on. How many children are on the bus altogether?

• 30

• 32

• 31

• 20