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Adding and Subtracting Fractions

- You will need
- Fraction factory pieces
- Loose leaf
- pencil

Problem 1

- Parties R Fun is a party supply store that is

closed for inventory. - The employees at the store are recording all of

the supplies in the store. - Kelsey finds 2 open boxes of balloons.
- The boxes are the same size.
- One is ½ full and the other is full.
- Kelsey combines the boxes and records the sum of

the contents.

Use fraction factory pieces to help determine

the total contents of the combined box.

Explain what you did and then provide diagrams.

Represent with Fraction Factory

How can we add together pieces that are

different?

Represent with Fraction Factory

Method 1 Represent both with the same piece!

Represent with Fraction Factory

Method 2 Compare to one whole!

Combine one half and one third. What area is left

to make one whole?

Represent with Fraction Factory

Since one sixth is needed to make one whole, One

half and one third combined must be five sixths!

Problem 2

- Alan is taking inventory of the helium tanks.
- He estimates that one tank is two thirds full and

one tank is one fourth full. - What single fraction represents the contents of

the two tanks together.

Using fraction factory

How can we add together pieces that are

different?

Using fraction factory

Replace with the same piece!

Using fraction factory

Method 2 Compare to one whole!

Combine two thirds and one fourth. What area is

left to make one whole?

Using fraction factory

Method 2 Compare to one whole!

Since there is one twelfth required to make one

whole, two thirds and one fourth combined must be

11 twelfths