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5th grade fractions worksheets
16 adding and subtracting fractions problems with unlike denominators, denominators up to 12 · 1 page + answer key
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Sixteen problems adding and subtracting fractions with different denominators, like 3/4 + 5/6. Some answers are greater than 1 and become mixed numbers. In the Common Core standards, this is the core 5th grade fraction skill: replace the fractions with equivalent ones that share a denominator, then add or subtract.
The answer key shows the common-denominator result and the simplest form (19/12 = 1 7/12), so children can see where a mistake happened. Pair it with multiplying fractions and dividing fractions for the rest of 5th grade fractions, or try the 5th grade math review.
Tips for using it
- Find the least common multiple of the denominators; it keeps numbers small.
- Rewrite both fractions before adding, then simplify at the end.
Variations
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Questions
How do you add fractions with unlike denominators?
Find a common denominator (a multiple of both), rewrite each fraction as an equivalent fraction with it, add the numerators, then simplify. 1/4 + 1/6 = 3/12 + 2/12 = 5/12.
Do you need the least common denominator?
No, any common denominator works, but the least one keeps the numbers smaller and makes simplifying easier.