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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.NBT.C.6

Grade 1 > Standards for Mathematical Practice > Number & Operations in Base Ten > Use place value understanding and properties of operations to add and subtract > 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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