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Common Core Teaching Resources

CCSS.MATH.CONTENT.3.OA.D.8

In Grade 3 Standards for Mathematical Practice Operations & Algebraic Thinking Solve problems involving the four operations, and identify and explain patterns in arithmetic
Solve two-step word problems using the four operations. Represent these problems using equations with a letter standing for the unknown quantity. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.