Adding and Subtracting Fractions with Unlike Denominators

Front

What is a fraction?

Back

A fraction represents a part of a whole and consists of a numerator (top number) and a denominator (bottom number).

Front

What does it mean to have unlike denominators?

Back

Unlike denominators are when the denominators of two or more fractions are different, making it necessary to find a common denominator to add or subtract them.

Front

How do you find a common denominator for 3/4 and 2/5?

Back

The least common multiple (LCM) of the denominators (4 and 5) is 20. So, the common denominator is 20.

Front

Convert 3/4 to a fraction with a denominator of 20.

Back

3/4 = 15/20.

Front

Convert 2/5 to a fraction with a denominator of 20.

Back

2/5 = 8/20.

Front

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

Back

Find a common denominator for the fractions.

Front

What is 3/8 + 2/4?

Back

7/8.

Front

What is 8/9 - 5/6?

Back

1/18.

Front

What is 4/8 + 1/3?

Back

13/24.

Front

Aden mixed 5/9 gallons of white paint and 1/6 gallons of blue paint. How many gallons was the mixture in all?

Back

13/18 gallons.