Grade 4 · Number and Operations—Fractions

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

Add and subtract mixed numbers with like denominators, e.g., by replacing each mixed number with an equivalent fraction, and/or by using properties of operations and the relationship between addition and subtraction.

Read this standard on the official Common Core site

Lessons that teach this standard

• Mixed Numbers and Improper Fractions: Converting Both Ways

  How to change an improper fraction into a mixed number by dividing, how to change it back by multiplying, and when each form is the useful 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.