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2.NBT.B.7 Common Core Games, Videos, Lessons, Worksheets, and Quizzes
CCSS.Math.Content.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.
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