Grade 5 · Number and Operations—Fractions

CCSS.MATH.CONTENT.5.NF.B.5a

Comparing the size of a product to the size of one factor on the basis of the size of the other factor, without performing the indicated multiplication.

Read this standard on the official Common Core site

Lessons that teach this standard

• Multiplying Fractions: Top Times Top, Bottom Times Bottom

  How to multiply fractions and mixed numbers, why the rule works using an area model, why the product can be smaller than what you started with, and how to cancel first.