Least Common Denominator (LCD) Worksheet

Grade 8 math worksheet focusing on finding the least common denominator to add and subtract fractions.

Grade 8 Math FractionsLeast Common Denominator

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Includes

Fill in the Blanks4 Short AnswerMultiple ChoiceTrue / False

Standards

CCSS.MATH.CONTENT.7.NS.A.1CCSS.MATH.CONTENT.7.NS.A.3

Topics

mathfractionsleast common denominatorLCDgrade 8

9 sections · Free to use · Printable

Least Common Denominator (LCD) Practice

Name:

Date:

Score:

Read each question carefully and follow the instructions. Show your work for full credit.

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

1. The LCD for 1/3 and 1/4 is .

2. The LCD for 3/8 and 5/6 is .

3. The LCD for 2/5 and 7/10 is .

4. The LCD for 1/2, 2/3, and 3/4 is .

5. Explain in your own words why finding the LCD is important when adding or subtracting fractions.

6. Which of the following is the LCD for 4/9 and 5/12?

7. Add the fractions: 1/6 + 3/8. Show your steps, including finding the LCD.

8. The LCD of two prime numbers will always be their product.

True

False

9. Sarah baked a pie. Her brother ate 1/4 of it and her sister ate 1/3 of it. What fraction of the pie did they eat in total? Use the LCD to solve.

10. Find the LCD for 7/15, 3/10, and 1/6.