Work with equal groups of objects to gain foundations for multiplication.
Operations and Algebraic Thinking
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Determine whether a group (up to 20) has an odd or even number of objects (i.e., by pairing objects or counting them by 2s).
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.