Kindergarten: Sorting & Counting Data

Warm up with a quick recall on the board. Collect answers to a question of interest (favourite fruit, pet), sort them into groups, count each group, then ask which has most/least and how many altogether.

Early data work is the first taste of statistics: sort objects into groups by a feature (colour, shape, type), count how many are in each group, and compare the groups (which has most, which has least, how many more). It is often shown as a simple picture graph with one picture per item. Model the method clearly, thinking aloud:

• Start by sorting real objects into clear categories, agreeing the sorting rule before counting.
• Count each group carefully and record the number, one count per category.
• Build a picture graph with one picture standing for one item, lined up so columns can be compared by height.
• Ask and answer the key questions: which group has the most, which the least, and how many more one has than another.
• Connect 'how many more' to subtraction by comparing the two counts.

Do the first few questions of the practice worksheet together, one child explaining each step. Check for understanding before releasing the class to work alone.

Students complete the worksheet independently. Hand out the three difficulty levels below so every child works at the right stretch.

Circulate and look for these, they are the usual sticking points:

• Overlapping categories so an object could belong to two groups.
• Miscounting a group, or counting one item in two categories.
• Not lining up the pictures, so a taller-looking column actually has fewer.
• Answering 'how many more' by reading one column instead of comparing the two.
• Miscounting a group, and confusing 'how many more' (the difference) with the total.

Pull the class back together. Ask one child to explain sorting & counting data in their own words, pose a single check question everyone answers on a mini whiteboard, and name what you will build on next lesson.

Use the independent worksheet as the evidence. A child who can complete it accurately and explain one answer has met the objective; anyone who cannot needs the easier level and a short reteach next session.