Adding and Subtracting Fractions with unlike Denominators

Front

What is a common denominator?

Back

A common denominator is a number that is a multiple of the denominators of two or more fractions, allowing them to be added or subtracted.

Front

How do you find a common denominator for two fractions?

Back

To find a common denominator, identify the least common multiple (LCM) of the denominators.

Front

What is the least common multiple (LCM) of 5 and 6?

Back

The least common multiple of 5 and 6 is 30.

Front

What must you do before adding or subtracting fractions with unlike denominators?

Back

You must convert the fractions to have a common denominator.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the first step in adding fractions with unlike denominators?

Back

Find a common denominator for the fractions.

Tags

CCSS.7.NS.A.1C

Front

If you have the fractions 2/6 and 1/2, what is their common denominator?

Back

The common denominator is 6.

Front

How do you convert 1/2 to have a denominator of 6?

Back

Multiply the numerator and denominator of 1/2 by 3 to get 3/6.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

What is the sum of 2/6 and 3/6?

Back

The sum is 5/6.

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Front

In the context of fractions, what does 'adding fractions' mean?

Back

Adding fractions means combining the values of two or more fractions into a single fraction.

Tags

CCSS.4.NF.B.3A

Front

What is the result of 5/9 + 1/6?

Back

The result is 13/18 gallons.

Tags

CCSS.7.NS.A.1C