====== MA 01.NBT.C.5   ======


====Standard:====
01.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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====Standard Unpacked:====
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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==== Lesson Plans: ====



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==== Resources: ====
Good Projects here: Illustrative Mathematics https://www.illustrativemathematics.org/1


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