Adding and Subtracting Fractions With Unlike Denominators

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Adding and Subtracting Fractions With Unlike
Denominators

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Whats Next
Directions Click on the smaller circles for a
refresher on specific topics before adding and
subtracting fractions with unlike denominators.
Adding and Subtracting Fractions with Unlike
Denominators
Adding and Subtracting Fractions with Common
Denominators
Finding the Least Common Multiple LCM
Generating Equivalent Fractions
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TEKS
Websites
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Lesson - Adding and Subtracting Fractions with
common denominator

• Steps
• Make sure the fractions have the same
  denominator.
• Add the numerators together.
• Leave the denominator the same.
• Example

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Lesson Generating Equivalent Fractions

• Steps
• Multiply the numerator and the denominator by the
  same number.
• By doing so, you will create an equivalent
  fraction.
• Example1

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1 Whole ½ 2/4 3/6 4/8
1/2 1/2
¼ ¼ ¼ ¼
1/6 1/6 1/6 1/6 1/6 1/6
1/8 1/8 1/8 1/8 1/8 1/8 1/8 1/8
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Lesson Finding the Least Common Multiple (LCM)

• Steps
• Write out the multiples of the first number.
• Write out the multiples of the second number.
• Find the smallest multiple that both numbers have
  in common.

Example 4 4, 8, 12, 16, 20, 24 5 5,
10, 15, 20 LCM 20
Example 2 2, 4, 6, 8, 10, 12, 14, 16 8
8 LCM 8
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Lesson - Adding Fractions with Unlike
Denominators

• Step
• Determine the denominators
• Find the least common multiple (LCM).
• Your least common multiple will become your least
  common denominator (LCD).
• Generate Equivalent Fractions using the LCM as
  the LCD.
• Add or Subtract Fractions.
• Example
• 1.
• LCM
• 3 2, 4, 6, 8, 10, 12
• 4 4, 8, 12

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Lesson - Subtracting Fractions with Unlike
Denominators

• Step
• Determine the denominators
• Find the least common multiple (LCM).
• Your least common multiple will become your least
  common denominator (LCD).
• Generate Equivalent Fractions using the LCM as
  the LCD.
• Add or Subtract Fractions.
• Example
• 1.
• LCM
• 2 2, 4, 6
• 4 4

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Websites

• For more help with adding and subtracting
  fractions you can visit these websites
• Cool Math For Kids
• Adding Fractions - Sheppard Software
• Adding and Subtracting Fractions Game
• Adding and Subtracting Fractions with Unlike
  Denominators

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