Calculating the actual and estimated values of an expression. Understanding estimation techniques using different properties of operations.

Mapped to CCSS Section# 3.OA.D.8, 3.NBT.A.1

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.,Use place value understanding to round whole numbers to the nearest 10 or 100.
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