What you know and what you are going to know - PowerPoint PPT Presentation

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What you know and what you are going to know

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Following a recipe Measuring or cutting lengths * Writing Fractions in Simplest Form A fraction is in simplest form when the only common factor of the numerator and ... – PowerPoint PPT presentation

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Title: What you know and what you are going to know

1
Topic 10
2
What you know and what you are going to know
• You know how to add and subtract whole numbers,
like 6 9
• Today you are going to learn how to add and
subtract fractions with like denominators.

3
• How do you add fractions?
• How do you subtract fractions?

3
4
Objective
• Add and subtract fractions and mixed numbers

4
5
When do you think you might need to add or
subtract fractions?
• Following a recipe

Measuring or cutting lengths
6
Think back to some of the things you already know
• Simplest form
• Equivalent fractions
• Common denominators
• Factors (GCF) and (LCF)
• Multiples (GCM) and (LCM)
• How to compare

7
Writing Fractions in Simplest Form
• A fraction is in simplest form when the only
common factor of the numerator and denominator is
1.
• 2 1 2
• 3 1 3
• 2. 27
• 36

1. List the common factors. 2. Find the GCF. 3.
Divide by the GCF.
7
8
Mixed Number / Improper Fraction
• When changing a mixed number to an improper
fraction, you need to multiply the denominator by
the integer, then add the numerator to the
product.
• Rewrite 4 1/2 as an improper fraction.
• 9/2

8
9
1. Check for common denominators.
2. Once the denominators are the same, add the
numerators.
try to simplify the answer choices.

9
10
practice
11
Video with like denominators

12
Find the Sum
• 8/9 2/9
• 9/16 4/32
• 8 2/3 6 1/2
• 10/9 1 1/9
• 22/32 11/16
• 14 7/6 15 1/6

12
13
Subtracting Fractions
1. Check for common denominators.
2. Once the denominators are the same, subtract the
numerator.
try to simplify the answer choices.

13
14
Find the Difference
• 4/5 - 2/5
• 8/12 - 4/9
• 9 - 6 5/8
• 2/5
• 8/36 2/9
• 2 3/8

14
15
video with unlike denominators
g-Fractions-With-UNLIKE-Denominators-1

16
Review!
• How do you add fractions?
• How do you subtract fractions?

16
17
Find the Difference, Find the Sum
• 5 - 2 3/4
• 4/5 3/10
• 2 ¼
• 1 1/10

17