MATHEMATICS FOR THE CURIOUS
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Part I: Mathematics Everyday and Everywhere
Part II: Mathematics Content for Young Children

Subitizing: What Is It? Why Teach It?

Author: Douglas H. Clements
Journal: Teaching Children Mathematics
Publication Date: March 1999
Clements’ (1999) article on subitizing provides a brief history of research on subitizing and clearly describes the two types of subitizing: perceptual (instantly seeing small quantities) and conceptual (involving larger quantities that may appear in familiar arrangements or perhaps adding on or composing two smaller quantities together). The article provides a number of implications for teaching along with several examples for addressing subitizing in early childhood classrooms.

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