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Least Common Denominator Practice

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Least Common Denominator Practice

Fractions and LCD illustration

📚 Part 1: Finding the Least Common Denominator

1. Find the LCD of 1/3 and 1/4.

Multiples of 3: ___________________

Multiples of 4: ___________________

LCD = _____

2. Find the LCD of 2/5 and 3/10.

Multiples of 5: ___________________

Multiples of 10: __________________

LCD = _____

3. Find the LCD of 3/4 and 5/6.

Multiples of 4: ___________________

Multiples of 6: ___________________

LCD = _____

4. Find the LCD of 7/8 and 1/3.

Multiples of 8: ___________________

Multiples of 3: ___________________

LCD = _____

✏️ Part 2: Rewriting Fractions with the LCD

5. Rewrite these fractions using their LCD:

1/3 = _____ and 1/4 = _____ (LCD = 12)

6. Rewrite these fractions using their LCD:

2/5 = _____ and 3/10 = _____ (LCD = 10)

7. Rewrite these fractions using their LCD:

3/4 = _____ and 5/6 = _____ (LCD = 12)

8. Complete this problem step by step:

Find the LCD and rewrite: 1/6 and 1/8

🎯 Part 3: Apply Your Knowledge

9. Sarah ate 2/3 of a pizza and Jake ate 3/4 of the same size pizza. To compare how much they ate, what LCD should you use?

LCD = _____

Sarah: 2/3 = _____

Jake: 3/4 = _____

10. Explain in your own words why we need to find the LCD before adding fractions with different denominators.

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