
Common Core Standards

Grade: 
1st Grade 
Standard: 
1.NBT.C.5 
Description: 
Given a twodigit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used. 
Standard: 
1.5.C 
Description: 
use relationships to determine the number that is 10 more and 10 less than a given
number up to 120; 


