standard_description: 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.
problem_activity: Problem 3
Pre-unit
How many dots are in each array? Explain or show your reasoning.
[IMG]
[IMG]
[IMG]


aligns: no