1.NBT.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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Number and Operations in Base Ten 1.NBT 5.Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.