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3.NBT. Grade 3 - Number and Operations in Base Ten

    3.NBT.A. Use place value understanding and properties of operations to perform multi-digit arithmetic.

      3.NBT.A.2. Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

      3.NBT.A.3. Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., $9 \times 80$, $5 \times 60$) using strategies based on place value and properties of operations.