# Category - Number Sense

## Conceptual Subitizing With Dot Cards

This dot card image was shared by Jo Boaler at a recent workshop. Because there are more than 5 dots, most people will conceptually subitize by...

## How Many Fruit? Subitizing, Unitizing and Multiplicative Thinking

As you saw in the Subitizing and Unitizing videos, these Counting Principles are mighty important. Consider using these images to prompt number talks...

## Unitizing – Principles of Counting and Quantity

Unitizing is the understanding that you can count a large group of items by counting smaller, equal groups of items from within the large group.

## Movement is Magnitude – Principles of Counting and Quantity

Movement is Magnitude is the counting and quantity principle that refers to the understanding that as you move up the counting sequence (or...

## Hierarchical Inclusion – Principles of Counting and Quantity

Hierarchical Inclusion is the counting and quantity principle that refers to understanding that all numbers preceding a number can be or are...

## Subitizing – Principles of Counting and Quantity

In general, subitizing is the ability to “see” or visualize a small amount of objects and know how many there are without counting. While this idea...

## Cardinality – Counting and Quantity Principles

Cardinality is the counting and quantity principle referring to the understanding that the last number used to count a group of objects represents...

## One-to-One Correspondence – Counting and Quantity Principles

One to One Correspondence is the counting and quantity principle referring to the understanding that each object in a group can be counted...

## Abstraction – Counting and Quantity

Abstraction is the counting and quantity principle referring to the understanding that we can count any collection of objects, whether tangible or...

## Conservation – Counting and Quantity Principles

Conservation is the counting and quantity principle referring to the understanding that the count for a set group of objects stays the same no matter...