2.NBT.B.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; justify the reasoning used with a written explanation. Understand that in 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.

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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