Use a 10-frame and Rekenrek (counting buddy) to tell if Dotson made a Mystery Math Mistake building “one less.” Represent objects from a story with a Rekenrek to tell which has “more.” Represent numbers using 10-frames to tell which has “more.”

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.)

Compare two numbers between 1 and 10 presented as written numerals.