Operations and Algebraic Thinking

Work with equal groups of objects to gain foundations for multiplication.
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.
Tasks
2.OA Task 16a
2.OA Task 16b

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.
Tasks
2.OA Task 17a; 2.OA 17a BLM
2.OA Task 17b