Have you ever seen children as young as three who can count up to 100, but struggle to answer when you ask what comes after number 100. It is not uncommon that young children learn rote counting without really understanding the meaning behind the numbers. How can we help our children develop a deeper understanding of numbers? While it may not be a well-known word, the answer is subitizing! Subitizing is a term that was coined by the theorist Piaget. It is defined as the ability to “see” a small amount of objects in a group without needing to count. For example, you see two cookies on the table and you automatically know there are two cookies on the table without needing to count. There are two types of subitizing: perceptual and conceptual. Perceptual subitizing is instantly knowing how many are in a given set of 5 or less items. On the other hand, conceptual subitizing, is the ability to see sets of numbers within larger sets, such as seeing two fours in the eight of a domino. In the early years of life, subitizing plays an essential part of developing number sense. Understanding “how many” without needing to count helps children: a) count on from a known patterned set; b) combine numbers from sets; and c) develop mathematical fluency.

How to Develop Subitizing

The ability to subitize can be developed by using pattern recognition skills. By working with a small set of numbers, children can start to develop an understanding of what numbers mean and what they represent. For example, five strawberries could be a set of two strawberries and a set of three strawberries, or a set of four strawberries and one strawberry. This means that a child looking at five strawberries doesn’t only see five strawberries, but also see two and three, or maybe one and four, and five and zero strawberries. Once children are familiar and comfortable with various representations of numbers 1 to 5, larger sets can be introduced (1 to 10).

How can we use subitizing to support our children’s developing understanding of numbers?

• Subitizing relies on visual patterns. Not all arrangements of a number are equally easy to “see.”

Activities to Build Subitizing Skills

This month, we will open the doors to the world of subitizing by introducing simple and fun DIY games that you can play with your 3 to 5 year-olds.

Stay tuned!

## Bilge Cerezci

Bilge Cerezci began her career as an educator in Turkey. After earning a bachelor of science degree in early childhood education from Bosphorus University in Istanbul, she nurtured the development of young minds as a teacher in Turkish preschools. Cerezci moved to Chicago in 2007 to pursue graduate studies at the Erikson Institute and completed her master’s degree in child development with an infancy specialization in 2009. She was awarded her PhD in applied child development from Loyola University Chicago and the Erikson Institute in 2017. During her doctoral studies, Cerezci worked for the Erikson Institute’s Early Math Collaborative, which was launched in 2007 to enhance the quality of early math education by helping preschool and early elementary school teachers incorporate effective early math instruction into their classrooms. Her work for the Early Math Collaborative focused on the refinement of a new tool designed to measure the quality of mathematics instruction in preschools and elementary schools. She has also served as an adjunct faculty member in the Child Development Department of the City Colleges of Chicago and the Teacher Education Department at Loyola University. Dr. Cerezci now resides in New York City, where she shares her knowledge and insights with the next generation of educators as an assistant professor in the Curriculum and Instruction Department at St. John’s University.

## 6 Replies to “Subitize This!”

1. Sonya Alexander says:

I too studied an 8 week course at Erikson Institute for Collaborative Math. We had a coach to come to our center twice a month. This is when I first learned about subitive. I learned so much about math and young children during this time.

2. Jimesha Strickland, I like this lesson because it teaches children how to add aslo.

3. Charlene OConnell says:

Subitizing was unfamiliar to me. I will now incorporate it, and see how the kids do. Should be fun!

4. Sandy Pendell says:

Thank you for your information concerning subitizing. What would your recommendations be concerning an Infant/Toddler Room ?