Grade 5 · Number and Operations—Fractions

CCSS.MATH.CONTENT.5.NF.A.1

Add and subtract fractions with unlike denominators (including mixed numbers) by replacing given fractions with equivalent fractions in such a way as to produce an equivalent sum or difference of fractions with like denominators.

Read this standard on the official Common Core site

Lessons that teach this standard

• Adding Fractions With Unlike Denominators

  How to add fractions with different bottom numbers: find a common denominator, rewrite both fractions, add the top numbers, then simplify. With mixed numbers too.

• Least Common Denominator: Finding a Shared Bottom Number

  How to find the least common denominator of two fractions using multiples, prime factors, or the multiply-the-bottoms shortcut, and why you need one.

• Subtracting Fractions: Like and Unlike Denominators

  How to subtract fractions with the same or different bottom numbers, and how to borrow when the fraction you are taking away is bigger than the one you have.