Warm up with a Mystery Math Mistake to tell whether Dotson’s 10-frames represent a number less than his focus number. Tell Which One Doesn’t Belong by examining four sets of pattern blocks. Use pattern blocks to make different shapes.

Write numbers from 0 to 20. Represent a number of objects with a written numeral 0-20 (with 0 representing a count of no objects).

Count to answer “how many?” questions about as many as 20 things arranged in a line, a rectangular array, or a circle, or as many as 10 things in a scattered configuration; given a number from 1-20, count out that many objects.

Identify whether the number of objects in one group is greater than, less than, or equal to the number of objects in another group, e.g., by using matching and counting strategies. (Include groups with up to ten objects.)