# Adding and Subtracting Fractions with Unlike Denominators - PowerPoint PPT Presentation

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## Adding and Subtracting Fractions with Unlike Denominators

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### Title: Adding and Subtracting Fractions with Unlike Denominators Author: Tom Eheman Last modified by: Jennifer Skelton Created Date: 9/24/2011 9:48:03 PM – PowerPoint PPT presentation

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Title: Adding and Subtracting Fractions with Unlike Denominators

1
Adding and Subtracting Fractions with Unlike
Denominators
2
Unlike Denominators
To add or subtract fractions, they MUST have
common denominators!
We can have common denominators by using
equivalent fractions.
3
Add or Subtract Fractions with Unlike Denominators
3 x 4 12
• Step 1 Write equivalent fractions with the
common denominator by
• x the denominators
• Find the LCM

Step 2 Add or Subtract
4
Example using LCM

LCM 8

5
Example
-
10 x 8 80
-

6
Example using LCM
-
LCM 18
-
7
Example using LCM

LCM 24

8
Problem Solving
Sarah is making a dessert that calls for cup
of crushed cookies. She already has cups. How
much more does she need?
cup
9
Problem Solving
There are three grades in Kyles middle
schoolsixth, seventh, and eighth. of the
students are in sixth grade and of the
students are in seventh grade. What fraction of
the students are in sixth and seventh grade?
of students
10