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...
Category - Number Sense
As you saw in the Subitizing and Unitizing videos, these Counting Principles are mighty important. Consider using these images to prompt number talks...
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 is the counting and quantity principle that refers to the understanding that as you move up the counting sequence (or...
Hierarchical Inclusion is the counting and quantity principle that refers to understanding that all numbers preceding a number can be or are...
Cardinality is the counting and quantity principle referring to the understanding that the last number used to count a group of objects represents...
Abstraction is the counting and quantity principle referring to the understanding that we can count any collection of objects, whether tangible or...
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...
Students have an understanding of order irrelevance when they are able to count a group of items starting from different places.
This “stable list” must be at least as long as the number of items to be counted. If counting 20 items, their stable list of numbers must be to at...