All children are born with an innate ability to perceive the difference between 1 and 2 objects. With support and experience, they can quickly perceive and name “how many” for collections of 3, 4, and 5 objects. This mathematical ability is called subitizing. From the Latin word meaning suddenly, the term subitize refers to the ability to "see" a small amount of objects and know “how many” there are instantly without counting.
Not all arrangements of the same number are equally easy to subitize — preschoolers will recognize that there are 5 dots quickly if they are arranged like the corners of a square with a dot in the middle, but may be slower or less sure if the 5 dots are in a straight line, particularly if they are very close together. Understanding that subitizing is innate is a good start, but experience matters, too. Children need many experiences of noticing and naming small quantities in a variety of arrangements to strengthen their number sense.
While it’s important that adults get to hear children count out loud, it’s also important that they acknowledge when children correctly identify a small amount without counting it at all.
The above are excerpts from the Collaborative's book Big Ideas of Early Mathematics: What Teachers of Young Children Need to Know (2014).
Browse our collection of resources tagged SUBITIZING.
September 26, 2018
This bingo-like game allows children to think about numbers in different ways. It focuses children on the attribute of quantity of small sets and helps them build a more robust number sense.
This game played with a hula hoop and bean bags demonstrates all the math that can be explored with a simple tossing game. Each round gives children practice seeing and naming smaller parts of a…
Moving from one activity to another just got a lot more mathematical with this simple routine that builds early number sense with preschoolers.
Transition time is a great time for mathematizing a daily routine. This dot card transition is a relatively simple routine that builds number sense in a concrete way, allowing them to subitize.
Creating grid games from classroom materials can be a great opportunity for fun and mathematical discussions involving small sets.
Grid games can be some of the earliest experiences children have with board games. And they can be both fun and mathematical.
This book is a delightful way to start a discussion about estimation in the early grades. Is it reasonable that Hugh Thomas caught a million fish?
A quick matching game with dot cards is a fun way for preschoolers to practice recognizing small sets without counting.
Students create visual representations of different numbers. All children will benefit most from exploring number arrangements by beginning with 3 and moving up from that.
A child selects a card with a given number of dots.