Counting

Counting is matching things one to one with the counting words in their fixed order; the last word says how many there are. Up to about four things we can see how many at a glance.

Depth 1 · Foundation

You know counting is one-to-one matching, that the last word tells how many whatever the order, and that patterns and groups let you see bigger numbers quickly.

Depths of understanding

1
Foundation
You know counting is one-to-one matching, that the last word tells how many whatever the order, and that patterns and groups let you see bigger numbers quickly.

Builds on

Nothing — you can start here.

Opens up

Natural numbersThe natural numbers are the words we count with.
NumeralsNumerals are a way of writing down what counting finds.
What a number isA number is what all the groups that match one to one share - the idea behind counting.