Classify objects and count the number of objects in each category.
- CCSS.Math.Content.K.MD.B.3 Classify objects into given categories; count the numbers of objects in each category and sort the categories by count.1
1 Limit category counts to be less than or equal to 10
This second part of the Measurement and Data Standard of the Core for kindergarten outlines a simple and straightforward expectation that children can “classify” and “sort” and then “count” and “sort” again.
Over the past several months this blog has discussed Sorting, Classifying, and Counting in a variety of ways. If you use the search engine at the side of the page, you will find activities, ideas, and discussions about all three of these mathematical concepts.
Data collection is usually done when a question has been posed (How many children are wearing short sleeves and how many children are wearing long sleeves?) and then the information is classified using attributes (short and long sleeves), sorted into categories (in this case – 2 categories) and then counted.
The picture above is a great example of a teacher in a 3-year-old class classifying, sorting and counting the children in her class. Take note of the way that she shows number in several ways.