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Common Core Standard 3.MD.C.7c Questions

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.

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Grade 3 Area CCSS: 3.MD.C.7c
Robert needs to determine the area of his garden. The garden is 12 feet long and 9 feet wide. Which statement explains how Robert can correctly calculate the area of his garden?
  1. Find the sum of 12 and 9
  2. Multiply 1 by 2, multiply 1 by 9, and find the sum of the products
  3. Multiply 1 by 9, multiply 2 by 9, and find the sum of the products.
  4. Multiply 10 by 9, multiply 2 by 9, and find the sum of the products.
Grade 3 Area CCSS: 3.MD.C.7c
Candace needs to determine the area of her playground. The playground is 25 feet long and 8 feet wide. Which statement explains how Candace can correctly calculate the area of her playground?
  1. Multiply 2 by 5, multiply 2 by 8, and find the sum of the products.
  2. Multiply 2 by 8, and 5 by 2, and find the sum of the products.
  3. Multiply 20 by 8, multiply 5 by 8, and find the sum of the products.
  4. Find the sum of 2 and 5 and multiply by 8, and find the sum of the products.

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