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Common Denominator Practice

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Common Denominator Practice worksheet preview

Common Denominator Practice

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WALT & Success Criteria

WALT (We Are Learning To):

- Understand what a common denominator is and why we use it.

- Find a common denominator (LCM) and rewrite fractions with it.

- Use common denominators to compare, add and subtract simple fractions.

Success Criteria:

1. I can identify the denominator and explain why denominators must match.

2. I can find the least common denominator for two fractions and rewrite them.

3. I can add or subtract fractions after rewriting with a common denominator.

Differentiation: Use fraction strips or number lines for support. For advanced learners, try adding three fractions or mixed numbers.

📚 Part 1: Multiple Choice

1. What is the least common denominator of 1/4 and 1/6?

2

6

12

24

2. Which pair shows 1/3 and 1/5 rewritten with a common denominator?

1/3 = 3/15 and 1/5 = 5/15

1/3 = 5/15 and 1/5 = 3/15

1/3 = 2/15 and 1/5 = 6/15

1/3 = 1/5 and 1/5 = 1/3

3. Which fraction is equivalent to 2/6?

1/2

1/3

3/6

2/3

4. Calculate 3/8 + 1/4. Choose the correct answer.

4/12

5/8

1/2

3/4

✏️ Part 2: Short Answers & Working

5. Find a common denominator and rewrite these fractions: 1/4 and 1/6. Write both equivalent fractions below.
6. Find the least common denominator for 2/3 and 3/4. Rewrite each fraction with that denominator.
7. Show your working: 3/8 + 1/4 = ________ . Rewrite each fraction with a common denominator, add, then simplify if needed.
8. Number-line check: Use the common denominator 12 to place and label 1/4 and 1/6 on a number line. (Sketch below)
Extension (optional — challenge): Find a common denominator and add: 3/8 + 1/3. Show working and give the answer in simplest form.

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