Fraction Addition

1
Fraction Addition
2
¾ ¾

• Count the pieces

3
Try some

• 4/5 3/5

4
Compare

5
Try some

6
Apples and Oranges

• The things you add have to be the same size

7
Common Denominator

• A number all original denominators divide into
  evenly
• 12 is a common denominator because 3 and 4 both
  divide 12 evenly.

8
Least Common Denominator

• To find the least common denominator
• Write the times table list for each denominator
• The smallest number that is in all rows is the
  least common denominator

9
Least Common Denominator

• To find the least common denominator
• Write the times table list for each denominator
• The smallest number that is in all rows is the
  least common denominator

10
(No Transcript)
11
Try One

• Find the common denominator for these fractions
• A) 2/3 3/5
• B) ¾ 7/12
• C) 2/5 3/8 7/10

12
Addition

• Find a common denominator
• Raise to the denominator
• Add
• Simplify

13
Addition

• Find a common denominator
• Raise to the denominator
• Add
• Simplify

14
Addition

• Find a common denominator
• Raise to the denominator
• Add
• Simplify

15
Try one