One-to-one correspondence

So how do you teach a child to ACCURATELY count items, more known as one-to-one correspondence?

Make a counter! :)

Here I chose to use my Diko's hand pattern so he'll eventually transfer that learning to counting with his fingers (Yes, I don't see anything bad with that, as other schools of thought do).

You may also use regular tables/boxes with numbers.

Pre-requisite knowledge:
Left-Right, Up-Down, Beginning - Ending