Measurement and Data

Geometric measurement: understand concepts of area and relate area to multiplication and to addition.

7. Relate area to the operations of multiplication and addition.

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In this 10-page article (PDF) from NCTM the authors present a progression of models they believe can be used with third graders to connect concepts of arithmetic and geometry to understand the distributive property as outlined in the CCSS. They believe exploring the area of multicolor arrays makes the distributive property intuitive for third graders. | Reference Materials, Article Grade Level: 3 | |

Students can use this interactive Java applet to explore multiplication, the distributive property, prime vs composite, square numbers, and more. Users fill in squares and draw rectangles on a 10 x 10 grid with 10 possible colors to use. Use the quick tour to get started. | Activity, Interactive Media Grade Level: 2, 3, 4, 5 |