Adding and Subtracting Unlike Fractions - PowerPoint PPT Presentation

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Adding and Subtracting Unlike Fractions

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Section 4.5 Adding and Subtracting Unlike Fractions Adding or Subtracting Unlike Fractions Step 1. Find the LCD of the denominators of the fractions. – PowerPoint PPT presentation

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Date added: 28 August 2019
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Title: Adding and Subtracting Unlike Fractions


1
Adding and Subtracting Unlike Fractions
Section 4.5
2
Adding or Subtracting Unlike Fractions
  • Step 1. Find the LCD of the denominators of the
    fractions.
  • Step 2. Write each fraction as an equivalent
    fraction whose denominator is the LCD.
  • Step 3. Add or subtract the like fractions.
  • Step 4. Write the sum or difference in simplest
    form.

Martin-Gay, Prealgebra, 5ed
3
Step 1 Find the LCD of 9 and 12.
Step 2 Rewrite equivalent fractions with the
LCD.
Martin-Gay, Prealgebra, 5ed
4
Step 3 Add like fractions.
Step 4 Write the sum in simplest form.
Martin-Gay, Prealgebra, 5ed
5
Writing Fractions in Order
One important application of the least common
denominator is to use the LCD to help order or
compare fractions.
The LCD for these fractions is 35.
Write each fraction as an equivalent fraction
with a denominator of 35.
Martin-Gay, Prealgebra, 5ed
6
Writing Fractions in Order . . .
Compare the numerators of the equivalent
fractions.
Martin-Gay, Prealgebra, 5ed
7
Evaluating Expressions Given Fractional
Replacement Values
x - y
Martin-Gay, Prealgebra, 5ed
8
Solving Equations Containing Fractions
Martin-Gay, Prealgebra, 5ed
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