In this 2.OA.3 Common Core Activity, students determine whether a group of objects (up to 20) has an odd or even number of members.

This odd or even to 20 activity lets 1st-3rd grade children pair counters on number cards and sort them onto an Odd or Even mat. Answer key included, so checking the sort is quick.

Using Even Or Odd Christmas Activity, students sort numbers in the even or odd categories on the sorting mat.