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; relate the strategy to a written method. 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 ResourcesSubtract 10s and 100s (no regrouping)Add on a number lineAdd within 1,000 using place value blocksSelect strategies for adding within 100Break apart 3-digit addition problemsAdd 10s and 100s (no regrouping)Breaking apart 3-digit addition problemsAdding 10 or 100Adding 1s, 10s, and 100sAdding and subtracting on number lineSubtracting 1, 10, or 100

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