Adding & 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 bottom numbers 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 fractions?

Back

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

Front

What is the least common multiple (LCM)?

Back

The least common multiple is the smallest number that is a multiple of two or more numbers.

Front

How do you add fractions with unlike denominators?

Back

1. Find a common denominator. 2. Convert each fraction to an equivalent fraction with the common denominator. 3. Add the numerators and keep the common denominator.

Front

How do you subtract fractions with unlike denominators?

Back

1. Find a common denominator. 2. Convert each fraction to an equivalent fraction with the common denominator. 3. Subtract the numerators and keep the common denominator.

Front

What is the first step in adding 5/9 and 1/6?

Back

The first step is to find a common denominator, which in this case is 18.

Front

What is the common denominator for 1/4 and 2/3?

Back

The common denominator for 1/4 and 2/3 is 12.

Front

If you have 1/2 and 1/3, what is the common denominator?

Back

The common denominator for 1/2 and 1/3 is 6.

Front

What is the result of adding 1/4 and 2/3?

Back

The result is 11/12 after finding a common denominator and adding the fractions.