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The Developing Mathematical Thinking Institute (DMTI) is dedicated to enhancing students’ learning of mathematics by supporting educators in the implementation of research-based instructional strategies through high-quality professional development. For more information contact Dr. Brendefur at
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Grades K and 1
Supplemental Module
Subitizing
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Using this module
Present the slides with dot patterns to students and give them only 1-2 seconds to determine the total number of dots before advancing to the blank slide.
Students should say the number of dots they see as quickly as possible.
Have students explain their methods of visualizing the number of dots if it is helpful to other students who struggle to recognize the visual patterns quickly.
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Quick Images
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How many dots do you see?
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Quick Images
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How many dots do you see?
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