Grade 4 · Number and Operations—Fractions

CCSS.MATH.CONTENT.4.NF.B.3a

Understand addition and subtraction of fractions as joining and separating parts referring to the same whole.

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.

• 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.