Adding Fractions with Different Denominators — KS2
Adding fractions with different denominators is a Year 5 and 6 objective that requires children to first find a common denominator before adding numerators. This builds on secure knowledge of equivalent fractions and understanding of LCM (lowest common multiple). Our worksheets scaffold the process clearly, helping children develop the three-step method: find the LCM, convert both fractions, then add.
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Key Skills Covered
The Three-Step Method
Step 1: Find the lowest common denominator (the LCM of the two denominators). For example, to add 1/3 + 1/4, the LCM of 3 and 4 is 12. Step 2: Convert both fractions to twelfths: 1/3 = 4/12, 1/4 = 3/12. Step 3: Add the numerators: 4/12 + 3/12 = 7/12. Our worksheets explicitly practice each step separately before combining them.
Adding Mixed Numbers
Year 6 children must also add and subtract mixed numbers (e.g. 2⅓ + 1¾). Our worksheets show two methods: converting to improper fractions first (often easier for complex calculations) and adding whole numbers and fractions separately (useful for simpler cases). Understanding both methods allows children to choose the most efficient approach for each question.
Sample Questions
1/3 + 1/4 = ?
Show answer
7/12
2/5 + 3/10 = ?
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7/10
3/4 + 2/3 = ?
Show answer
17/12 = 1 5/12
2 1/2 + 1 3/4 = ?
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4 1/4
5/6 + 1/4 + 1/3 = ?
Show answer
17/12 = 1 5/12
More Fractions Resources for Key Stage 2
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