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Fractions and Decimals

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Lesson 11 Adding and Subtracting by Renaming Target: Calculate sums and differences of mixed numbers by renaming. Rewrite the fractions using the LCD. – PowerPoint PPT presentation

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Title: Fractions and Decimals


1
Fractions and Decimals
Lesson 11
  • Adding and Subtracting by Renaming

2
Warm-up

3
Adding and Subtracting by Renaming
  • Target
  • Calculate sums and differences of
  • mixed numbers by renaming.

4
Adding and Subtracting by Renaming
  1. Rewrite the fractions using the LCD.
  2. Rename before subtracting, if necessary.
  3. Add or subtract fractions.
  4. Add or subtract the whole numbers.
  5. Rename after adding or subtracting, if necessary.

5
Example 1
  • Find the value of .
  • Rewrite the fractions using the LCD, 10.
  • Add fractions and whole numbers.
  • Rename the improper fraction.

6
Example 2
  • Mahavir biked miles on Saturday. He
    biked miles on Sunday. How much further
    did he bike on
  • Sunday?
  • Write the problem.
  • Rewrite fractions
  • with the LCD, 12.
  • Rename and subtract.
  • Mahavir rode miles further on Sunday.

7
Example 3
  • The longest python on record was 33 feet long.
    The
  • average male python grows to be feet
    long. What is
  • the difference between the average male python
    and the
  • world's longest python?
  • Write the problem.
  • Rename .
  • Subtract.
  • The worlds longest python is
    feet longer.

8
Exit Problems
  1. Find the value of .
  2. Find the value of .
  3. Find the value of .
  4. Find the value of .

9
Communication Prompt
  • Which is easier for you when adding or
    subtracting
  • mixed numbers renaming or changing mixed numbers
    to
  • improper fractions?
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