Grade 3 · Measurement and Data

CCSS.MATH.CONTENT.3.MD.C.7c

Use tiling to show in a concrete case that the area of a rectangle with whole-number side lengths a and b + c is the sum of a × b and a × c. Use area models to represent the distributive property in mathematical reasoning.

Read this standard on the official Common Core site

Lessons that teach this standard

• Splitting a Rectangle to Find Its Area

  How cutting a rectangle into two smaller rectangles keeps the total area the same, and how that turns a hard times fact into two facts you already know.