Consider using these images to prompt number talks around conceptual subitizing and unitizing as we push students thinking from additive to...

# Category - Number Sense

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...

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...

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

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