3.NOS.D: Use place value understanding and properties of operations to perform multi-digit arithmetic.

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

3.NOS.D.6Estimate sums and differences within 1,000 using benchmark numbers and front-end estimation. Determine when an estimate is appropriate and when an exact answer is needed.3.NOS.D.7Fluently add and subtract within 1,000. a. Use computational strategies efficiently (e.g., decomposition, partials sums, compensation, make ten/hundred/thousand) to add and subtract. b. Use properties of operations, and/or the inverse relationship between addition and subtraction. c. Determine and explain when a strategy is most efficient.3.NOS.D.8Multiply one-digit whole numbers by multiples of 10 in the range of 10-90 (e.g., 9 × 80;60 × 5) using strategies based on place value and properties of operations.

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