Add and Subtract 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 in fractions?

Back

Unlike denominators are denominators that are not the same. For example, in the fractions 1/3 and 1/4, the denominators 3 and 4 are unlike.

Front

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

Back

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

Front

What is the least common multiple (LCM)?

Back

The least common multiple is the smallest multiple that is exactly divisible by each of the numbers in a set.

Front

What is the least common denominator of 4/8 and 1/3?

Back

The least common denominator of 4/8 and 1/3 is 24.

Front

What is the least common denominator of 2/3 and 1/2?

Back

The least common denominator of 2/3 and 1/2 is 6.

Front

What is the least common denominator of 8/9 and 1/3?

Back

The least common denominator of 8/9 and 1/3 is 9.

Front

What is the least common denominator of 1/4 and 1/6?

Back

The least common denominator of 1/4 and 1/6 is 12.

Front

What is the least common denominator of 3/4 and 5/6?

Back

The least common denominator of 3/4 and 5/6 is 12.

Front

How do you add fractions with unlike denominators?

Back

To add fractions with unlike denominators, first find the least common denominator, convert each fraction to an equivalent fraction with the LCD, and then add the numerators.