adding and subtracting fractions with uncommon denominators

Front

What is the first step in adding or subtracting fractions with uncommon denominators?

Back

Find a common denominator for the fractions.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is a common denominator?

Back

A common denominator is a shared multiple of the denominators of two or more fractions.

Front

How do you find the least common denominator (LCD) of two fractions?

Back

List the multiples of each denominator and find the smallest multiple that appears in both lists.

Front

What is the formula for adding two fractions with different denominators?

Back

(a/b) + (c/d) = (a*d + b*c) / (b*d) where b and d are the denominators.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the formula for subtracting two fractions with different denominators?

Back

(a/b) - (c/d) = (a*d - b*c) / (b*d) where b and d are the denominators.

Tags

CCSS.7.NS.A.1C

Front

What do you do after finding a common denominator when adding or subtracting fractions?

Back

Convert each fraction to an equivalent fraction with the common denominator.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the result of 5/12 + 1/3?

Back

3/4

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the result of 1/2 - 1/4?

Back

1/4

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Front

What is the result of 3/5 + 2/15?

Back

13/15

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the result of 7/8 - 1/4?

Back

5/8

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2