Bar Models: Addition and Subtraction

Front

What is a bar model?

Back

A bar model is a visual representation used to show numbers and their relationships, often used in addition and subtraction.

Tags

CCSS.5.NBT.B.7

Front

What does addition mean?

Back

Addition is the process of finding the total or sum by combining two or more numbers.

Front

What does subtraction mean?

Back

Subtraction is the process of taking one number away from another.

Front

How do you know if you should add or subtract?

Back

You should add when you are combining amounts and subtract when you are taking away.

Tags

CCSS.1.OA.A.1

Front

What is the number sentence for 272 baseball cards minus 137 baseball cards?

Back

272 - 137 = ?

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

If Tom has 175 baseball cards and gets 67 more, how do we find out how many he has now?

Back

We add: 175 + 67 = 242.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the total number of flowers if there are 157 pink, 29 white, and 300 purple flowers?

Back

157 + 29 + 300 = 486 flowers.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the first step in solving a bar model problem?

Back

Identify whether you need to add or subtract based on the question.

Tags

CCSS.3.OA.D.8

Front

What does it mean if a bar model shows two bars combined?

Back

It means you should add the numbers represented by the bars.

Tags

CCSS.1.OA.A.1

Front

What does it mean if a bar model shows one bar being taken away from another?

Back

It means you should subtract the numbers represented by the bars.

Tags

CCSS.5.NBT.B.7