Sign up for an account
Forgot your password?
Join our community!
Subscribe to our Newsletter!
Visit Our Blog
Subscribe to our Newsletter
In the News
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