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Common Core Teaching Resources

CCSS.MATH.CONTENT.1.NBT.C.5

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.5
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

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