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1.NBT.C.6 Common Core Games, Videos, Lessons, Worksheets, and Quizzes

CCSS.Math.Content.1.NBT.C.6:
Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), 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 and explain the reasoning used.

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