Title: Adding and Subtracting Fractions
1Adding and Subtracting Fractions
- You will need
- Fraction factory pieces
- Loose leaf
- pencil
2Problem 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.
3Represent with Fraction Factory
How can we add together pieces that are
different?
4Represent with Fraction Factory
Method 1 Represent both with the same piece!
5Represent with Fraction Factory
Method 2 Compare to one whole!
Combine one half and one third. What area is left
to make one whole?
6Represent with Fraction Factory
Since one sixth is needed to make one whole, One
half and one third combined must be five sixths!
7Problem 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.
8Using fraction factory
How can we add together pieces that are
different?
9Using fraction factory
Replace with the same piece!
10Using fraction factory
Method 2 Compare to one whole!
Combine two thirds and one fourth. What area is
left to make one whole?
11Using 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