2.NBT.7: Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, like base-ten units such as hundreds and hundreds, tens and tens, ones and ones are used; and sometimes it is necessary to compose or decompose tens or hundreds.

Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, like base-ten units such as hundreds and hundreds, tens and tens, ones and ones are used; and sometimes it is necessary to compose or decompose tens or hundreds.

Example Problems
Evaluate:
Evaluate:
Evaluate:
Khan Academy Resources
Subtract within 1,000 using place value blocksSubtract on a number lineSubtract 10s and 100s (no regrouping)Add on a number lineAdd within 1,000 using place value blocksAdd using groups of 10 and 100Select strategies for adding within 100Break apart 3-digit addition problemsSelect strategies for adding within 1000Add 10s and 100s (no regrouping)Breaking apart 3-digit addition problemsSubtracting 3-digit numbers (no regrouping)Adding 10 or 100Adding 1s, 10s, and 100sAdding and subtracting on number lineAddition using groups of 10 and 100Subtracting 1s, 10s, and 100sAdding 3-digit numbers (no regrouping)Subtracting 1, 10, or 100Subtracting with place value blocks (regrouping)
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