New York State Learning Standards and Core Curriculum
NY-3.OA. Operations & Algebraic Thinking
Solve problems involving the four operations, and identify and extend patterns in arithmetic.
NY-3.OA.8b. Assess the reasonableness of answers using mental computation and estimation strategies including rounding.
NY-3.NBT. Number & Operations in Base Ten
Use place value understanding and properties of operations to perform multi-digit arithmetic.
NY-3.NBT.1. Use place value understanding to round whole numbers to the nearest 10 or 100.