AI generatedNumberKS3 / GCSE

Adding three fractions

Find one common denominator for all three fractions, not just the first two.

  • Find one common denominator for all three fractions, not just the first two.
  • Scale every numerator and denominator by the same factor. Add only the numerators.
  • Simplify the result and, if useful, write an improper fraction as a mixed number.

Example 1

Add. Give your answer in simplest form.

Use 30 as a common denominator for all three fractions.Add the numerators; keep the common denominator.

Example 2

Add. Give your answer in simplest form.

Use 6 as a common denominator for all three fractions.Add the numerators; keep the common denominator.

Remember
Use the worked steps to check your method, not just the final answer.

Your turn

Question 1

Add. Give your answer in simplest form.

Check answer
Use 42 as a common denominator for all three fractions.Add the numerators; keep the common denominator.
Question 2

Add. Give your answer in simplest form.

Check answer
Use 24 as a common denominator for all three fractions.Add the numerators; keep the common denominator.
Question 3

Add. Give your answer in simplest form.

Check answer
Use 18 as a common denominator for all three fractions.Add the numerators; keep the common denominator.
Question 4

Add. Give your answer in simplest form.

Check answer
Use 30 as a common denominator for all three fractions.Add the numerators; keep the common denominator.
Question 5

Add. Give your answer in simplest form.

Check answer
Use 66 as a common denominator for all three fractions.Add the numerators; keep the common denominator.
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