Using 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 in addition and subtraction problems.

Tags

CCSS.2.NBT.B.7

Front

When do we use addition?

Back

We use addition when we want to find the total of two or more numbers.

Tags

CCSS.1.OA.A.1

Front

When do we use subtraction?

Back

We use subtraction when we want to find out how many are left after taking some away.

Tags

CCSS.2.OA.A.1

Front

If Jim made 462 sandwiches and 156 are tuna, how do we find out how many chicken sandwiches he made?

Back

We subtract: 462 - 156 = 306 chicken sandwiches.

Tags

CCSS.3.OA.D.8

Front

Mr. McQuerry had 776 juice boxes and sold 102. How do we find out how many he has now?

Back

We subtract: 776 - 102 = 674 juice boxes.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What is the total number of flowers if there are 124 pink flowers and 32 white flowers?

Back

We add: 124 + 32 = 156 flowers.

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Front

What does it mean to 'add'?

Back

To add means to combine two or more numbers to get a larger number.

Tags

CCSS.5.NBT.B.7

Front

What does it mean to 'subtract'?

Back

To subtract means to take one number away from another.

Tags

CCSS.2.OA.A.1

Front

If a bar model shows two groups being combined, what operation is being used?

Back

Addition.

Tags

CCSS.2.OA.A.1

Front

If a bar model shows one group being taken away from another, what operation is being used?

Back

Subtraction.

Tags

CCSS.2.OA.A.1