add and subtract within 20

There are 14 party hats in a box. There are 10 party hats in a bag. How many fewer hats are in the bag than in the box?

• 14

• 10

• 4

• 24

Diego has 6 apples. Leslie has 9 apples. How many more apples does Leslie have than Diego?

• 3

• 15

• 6

• 9

When you are subtracting, do you use a + or - ?

• +
• -

Use the model to complete the equations.

2 + ____ = 9

9 – 2 = ____

What number is missing?

• 4

• 5

• 6

• 7

Which addition sentence helps you solve 5 – 1 = ____?

• 3 + 2 = 5

• 0 + 1 = 1

• 1 + 4 = 5

• 1 + 5 = 6

Choose the addition fact that helps you solve the problem.

9 birds were flying in the air.

2 birds landed on a tree.

How many birds are in the air now?

• 4 + 5 = 9

• 8 + 2 = 10

• 2 + 7 = 9

• 9 + 2 = 11

What is the missing part?

5 + _____ = 7

7 – 5 = _____

• 2

• 3

• 4

• 5

Peter has 8 stamps. He uses 1 to mail a letter.

How many stamps does he have left?

Think addition to help you subtract.

Find the missing part.

• 5

• 6

• 7

• 8

8-6 = ?

• 2

• 1

• 0

• 8

Which addition fact help you to subtract

10 - 4 =?

• 2 + 1 = 3

• 4 + 6 = 10

• 2 + 5 = 7