2.NOS.C: Use representations, place value understanding, and properties of operations to add and subtract.

Use representations, place value understanding, and properties of operations to add and subtract.

2.NOS.C.7Represent whole number sums and differences within 100 using lengths on a number line.2.NOS.C.8Fluently 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.2.NOS.C.9Add and subtract within 1000, recognizing that when adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds. a. Use concrete models or drawings to add and subtract. b. Use strategies based on place value (counting on, partial sums, making tens, etc.) to add and subtract. c. Use properties of operations, and/or the relationship between addition and subtraction to add and subtract. d. Represent and explain the calculation by connecting the strategy used to the meaning of addition and subtraction.2.NOS.C.10Mentally add and subtract 10 or 100 to a given number 100-900.

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