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Common Core Teaching Resources

CCSS.MATH.CONTENT.2.OA.C.3

In Grade 2 Standards for Mathematical Practice Operations & Algebraic Thinking Work with equal groups of objects to gain foundations for multiplication
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.