Least Common Denominator

Front

What is a Least Common Denominator (LCD)?

Back

The Least Common Denominator (LCD) is the smallest number that can be used as a common denominator for two or more fractions.

Front

How do you find the Least Common Denominator of two fractions?

Back

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

Front

What is the Least Common Denominator of 1/4 and 1/6?

Back

The LCD 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 is NOT a common denominator.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

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 is NOT a common denominator.

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

Front

Find the least common denominator of 1/5 and 5/9.

Back

The least common denominator is 45.

Front

Find the least common denominator of 2/3 and 4/15.

Back

The least common denominator is 15.

Front

Find the lowest common denominator of 2/7 and 2/21.

Back

The lowest common denominator is 21.

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.

Front

Why is it important to find the Least Common Denominator?

Back

Finding the LCD is important for adding, subtracting, or comparing fractions.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2