2.NOS.C.8: Fluently add and subtract within 100. a. Use strategies based on counting (e.g., counting on, counting back) and place value (e.g., partial sums, making tens, etc.) to add and subtract. b. Use properties of operations, and the inverse relationship between addition and subtraction to add and subtract. c. Determine and explain when a strategy is most efficient.

Fluently add and subtract within 100. a. Use strategies based on counting (e.g., counting on, counting back) and place value (e.g., partial sums, making tens, etc.) to add and subtract. b. Use properties of operations, and the inverse relationship between addition and subtraction to add and subtract. c. Determine and explain when a strategy is most efficient.

Example Problems

Subtract:

120,000 - 84,765

Subtract:

700,004 - 65,289

Subtract:

342,800 - 98,765

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