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 denominators that are not the same in two or more fractions.

Front

How do you add fractions with unlike denominators?

Back

To add fractions with unlike denominators, first find a common denominator, convert the fractions, and then add the numerators.

Front

How do you subtract fractions with unlike denominators?

Back

To subtract fractions with unlike denominators, find a common denominator, convert the fractions, and then subtract the numerators.

Front

What is the least common denominator (LCD)?

Back

The least common denominator is the smallest multiple that two or more denominators share.

Front

Example of finding the LCD for 1/4 and 1/6?

Back

The LCD of 4 and 6 is 12.

Front

Convert 1/4 to a fraction with a denominator of 12.

Back

1/4 = 3/12.

Front

Convert 1/6 to a fraction with a denominator of 12.

Back

1/6 = 2/12.

Front

What is the sum of 3/12 and 2/12?

Back

3/12 + 2/12 = 5/12.

Front

What is the difference of 3/12 and 2/12?

Back

3/12 - 2/12 = 1/12.