Adding and Subtracting Fractions

1
Adding and Subtracting Fractions

• 3-2

2
Common Denominator

• The same denominator
• Example

3
Like Fractions

• Fractions with common denominators
• Example

4
Unlike Fractions

• Fractions that do not have common denominators
• Example

5
Least Common Denominator (LCD)

• The smallest number that is a multiple of both
  denominators
• Example
• 2 x 1 2 8 x 1 8
• 2 x 2 4 8 x 2 16
• 2 x 3 6 8 x 3 24
• 2 x 4 8 8 x 4 32

6
Adding and Subtracting Unlike Fractions

• Need a common denominator
• Example
• 
  - -

7
Another example

8
Homework

• Pages 87-89
• 2, 5, 12, 17, 26, 33, 38, 43, 49, 50