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Operations and Algebraic Thinking
Work with equal groups of objects to gain foundations for multiplication.
2.OA.C. Work with equal groups of objects to gain foundations for multiplication.
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.
Buttons odd and even
Red and Blue Tiles
2.OA.C.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.
Counting Dots in Arrays
Partitioning a Rectangle into Unit Squares