Midcontinent Research for Education and Learning
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Common Core Mathematics K2
Cluster
Work with equal groups of objects to gain foundations for multiplication.
Grade 2
2.OA.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.
2.OA.4.
Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.