1. Adding and Subtracting Fractions With Unlike Denominators
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2. Adding and Subtracting
What’s 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

3. 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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4. 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: 1
1 Whole
2/4
3/6
4/8
1/2
1/6
1/8
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5. 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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6. 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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7. 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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8. 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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