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fraction addition - PowerPoint PPT Presentation

Fraction Addition. ¾ + ¾ . Count the pieces. Try some. 4 / 5 + 3 / 5. Compare. Try some. Apples and Oranges. The things you add have to be the same size. Common Denominator. Common Denominator. A number all original denominators divide into evenly

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Presentation Transcript

• Count the pieces

• 4/5 + 3/5

• The things you add have to be the same size

Common Denominator

• A number all original denominators divide into evenly

• 12 is a common denominator because 3 and 4 both divide 12 evenly.

• 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

• 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

• Find the common denominator for these fractions

• A) 2/3 + 3/5

• B)¾ + 7/12

• C)2/5 + 3/8 + 7/10

• Find a common denominator

• Raise to the denominator

• Simplify

• Find a common denominator

• Raise to the denominator

• Simplify

• Find a common denominator

• Raise to the denominator