Adding and Subtracting Fractions with Unlike Denominators

Front

What is the first step to adding or subtracting fractions with unlike denominators?

Back

Find the least common denominator (LCD) for the fractions.

Tags

CCSS.7.NS.A.1C

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 they have in common.

Front

What is the least common multiple (LCM) of 4 and 10?

Back

The LCM of 4 and 10 is 20.

Front

How do you convert fractions to have a common denominator?

Back

Multiply the numerator and denominator of each fraction by the necessary factor to reach the least common denominator.

Front

What is the result of 3/4 - 2/10?

Back

The result is 11/20.

Tags

CCSS.7.NS.A.1C

Front

What is the result of 5/10 + 8/5?

Back

The result is 2 1/10.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

How do you simplify the fraction 8/10?

Back

Divide both the numerator and denominator by their greatest common factor, which is 2, resulting in 4/5.

Front

What is the greatest common factor (GCF) of 8 and 10?

Back

The GCF of 8 and 10 is 2.

Front

When adding or subtracting fractions, what must you do after finding a common denominator?

Back

Adjust the numerators accordingly and then perform the addition or subtraction.

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Front

What is the result of 8/10 - 1/5?

Back

The result is 3/5.

Tags

CCSS.7.NS.A.1C