Least Common Denominator (LCD) Worksheet

Least Common Denominator (LCD)

Read each question carefully and follow the instructions to find the Least Common Denominator (LCD) or compare fractions. Show your work where necessary.

Find the Least Common Denominator (LCD) for each pair of fractions.

1. 1/3 and 1/4. LCD:  

2. 2/5 and 3/10. LCD:  

3. 1/2 and 3/7. LCD:  

4. 5/6 and 7/9. LCD:  

1. Which of the following is the LCD for 1/4 and 2/6?

2. To add 1/8 and 3/12, what is the smallest common denominator you should use?

Use the LCD to compare the following fractions. Write <, >, or = in the blank.

1. 3/4   5/6

2. 2/3   7/10

3. 5/8   15/24

Shade the fraction bars to represent the given fractions, then use a common denominator to compare them.

1. Compare 1/2 and 2/5.

LCD:  

1/2   2/5

Solve the following word problem.

Sarah ate 1/3 of a pizza, and Tom ate 1/4 of the same pizza. Who ate more pizza? Explain your answer using the LCD.