Using Bar Models: Addition and Subtraction

Front

What is a bar model?

Back

A bar model is a visual representation used to help understand addition and subtraction problems by showing quantities as bars.

Front

What does it mean to subtract?

Back

Subtracting means taking away a number from another number.

Front

What does it mean to add?

Back

Adding means putting together two or more numbers to find a total.

Front

If Tom has 320 strawberries and throws away 26, what operation do we use?

Back

Subtract because we are taking away rotten strawberries.

Front

If Mr. McQuerry sells 102 juice boxes from 776, what operation do we use?

Back

Subtract because we are finding out how many juice boxes are left after selling some.

Front

How do you find out how many chicken sandwiches Jim made if he made 462 sandwiches and 156 were tuna?

Back

Subtract 156 from 462 to find the number of chicken sandwiches.

Front

What operation is used when Sally gives away some marbles?

Back

Subtract because we are finding out how many marbles she has left.

Front

What is the first step in solving a subtraction problem?

Back

Identify the total amount and the amount being taken away.

Front

What is the first step in solving an addition problem?

Back

Identify the two amounts that need to be combined.

Front

In a bar model, what does the length of the bar represent?

Back

The length of the bar represents the quantity of the number it stands for.