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This research aimed to study early childhood mathematics employing HighScope approach within lesson study context. Target group were 42 kindergarten students, studied in the 1st semester of 2019 academic year, Demonstration School, Khon Kaen University, Thailand. Research instruments were fieldnote, photo camera, and worksheets. Data were collected by fieldnote taking and photo recoding, which were analyzed by applying framework of mathematics contents for early childhood, according to National Association for the Education of Young Children (2010). Research results reveal that, in lesson study context (collaborative Plan – Do – See), students had learnt mathematics through HighScope approach consisted of Plan, Do and Review activities. Five mathematics strands were founded: 1) Number and operations, students have the ideas of group, number, symbol and number sense, 2) Geometry and spatial sense, they have the ideas of line, angle, geometric shapes, symmetry and dimensional relationship, 3) Measurement, they have the ideas of comparing sizes, characteristics and number of items, 4) Pattern/algebraic thinking, they have the ideas of number relationship and pattern of objects, and 5) Displaying and analyzing data, among four activities, all students collaboratively worked together to present their own cards representing their preferred activities in a form of bar chart.