NumihanaRename fractions before adding.
Different denominators describe different-sized parts. Rename both fractions using a common denominator so that the parts match, then add.
When this helps
Useful for adding unlike fractions. Multiplying the denominators always provides a common denominator, although a smaller one may also work.
A common slip
Multiply the numerator and denominator by the same factor to keep the fraction equivalent.
Worked example
1/2 + 2/4 =
Use 2 × 4 as a common denominator. What is it?
This task uses the product denominator; it need not be the smallest common denominator.
8What is the first renamed numerator?
Multiply the first numerator by the second denominator.
4What is the second renamed numerator?
Multiply the second numerator by the first denominator.
4What is the final answer?
Recombine your working and check it against the original question.
1
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Teaching context
This lesson practises mathematical representations and calculations. The displayed practice uses selected England Year 6 skills; the strategy can also help learners in other years.
Curriculum alignment describes the mathematical skill. It does not mean this is the only required teaching method.
Department for Education: mathematics programmes of study ↗Original method lesson v1.
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