Adding Fractions with Unlike Denominators

Front

What is a common denominator?

Back

A common denominator is a number that can be used as a denominator for two or more fractions, allowing them to be added or compared.

Front

How do you find a common denominator for two fractions?

Back

To find a common denominator, list the multiples of each denominator and find the smallest multiple that appears in both lists.

Front

What is the least common multiple (LCM)?

Back

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

Front

Find the common denominator for 2/3 and 3/4.

Back

The common denominator is 12.

Front

Which of these numbers could NOT be a common denominator for 2/4 and 3/8: 32, 12, 8, 24?

Back

12 could NOT be a common denominator.

Front

Find the common denominator for 1/5 and 5/6.

Back

The common denominator is 30.

Front

Find the common denominator for 3/10 and 1/5.

Back

The common denominator is 10.

Front

Which of these numbers could NOT be a common denominator for 1/3, 2/5, and 3/10: 15, 30, 60, 90?

Back

15 could NOT be a common denominator.

Front

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

Back

The first step is to find a common denominator for the fractions.

Front

Why is it important to have a common denominator when adding fractions?

Back

Having a common denominator allows you to combine the fractions into a single fraction.