# Category - Number Sense

## 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...

## Order Irrelevance – Counting and Quantity Principles

The order in which items are counted is irrelevant. Students have an understanding of order irrelevance when they are able to count a group of items...

## Stable-Order – Principles of Counting and Quantity

The first principle of counting involves the student using a list of words to count in a repeatable order. This “stable list” must be at least as...

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