# Lesson 6.1: Adding and Subtracting Fractions - PowerPoint PPT Presentation

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## Lesson 6.1: Adding and Subtracting Fractions

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### Lesson 6.1: Adding and Subtracting Fractions Standards: NS 1.2 and NS 2.2 Objectives: Add and subtract fractions with like denominators. Add and subtract fractions ... – PowerPoint PPT presentation

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Title: Lesson 6.1: Adding and Subtracting Fractions

1
Lesson 6.1 Adding and Subtracting Fractions
• Standards NS 1.2 and NS 2.2
• Objectives Add and subtract fractions with like
denominators.
• Add and subtract fractions with unlike
denominators.

2
Types of Fractions
• Proper fractions
• Improper fractions
• Whole numbers
• Mixed Numbers

3
Like Denominators
subtract the numerators!
• Do NOT add or subtract the denominators.

4
Problem 1
• Reduce if necessary.

5
Problem 2
• Subtract the fractions.
• Reduce if necessary.

6
Problem 3
• Reduce if necessary.

7
Problem 4
• You work at a pizza shop. A customer orders ¼
mushrooms and 1 ¾ pepperoni.
• How many pizzas did the customer order
• (¼ 1 ¾)?
• Draw a picture of the fractions, then solve using
• Reduce if necessary.

Thats right! 2 Whole Pizzas!
8
Unlike Denominators
• You need to find a common denominator first!
• To do this, use the LCM of the two denominators.
• After the denominators are the same, add or
subtract the numerators!

9
Problem 1
• Subtract the fractions.
• Simplify if possible.

10
Problem 2
• You run 3 ½ miles and then walk ¾ mile to cool
down. What distance do you cover while exercising?

11
Problem 3
• Draw a picture of the fractions, then solve using
• Reduce if necessary.
• You work at a pizza shop. A customer orders ¼
pineapple, ½ sausage, and 11/8 cheese, and 1/8
• How many pizzas did the customer order
• ( ¼ ½ 11/8 1/8)?

12
Problem 4
• 3 Things to Think About
• I need common denominators
• I need to make sure I multiply the numerator and
denominator by the same amount to make an
equivalent fractions.
• I will then combine like terms (if the
denominators are the same).