2.OA.C.3 Common Core Games, Videos, Lessons, Worksheets, and Quizzes

CCSS.Math.Content.2.OA.C.3:
Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.