Have you been to a swimming pool lately?
When you start learning about swimming it may be that you will go down the steps carefully to reach the bottom, or use the ladder from the side of the pool.
Here's a picture of a set of steps and the ladder.
You'll probably notice that I've coloured the steps.
The first step into the water is light green, the second step is purple, the third red and so on.
The same is true of the ladder.
Later, I'll be thinking about numbering these coloured steps.
Maybe it's time to number these coloured steps.
I think I'll go for numbering them down from the water surface.
Can you invent your own way of numbering the steps which go under the water?
When you've numbered your steps in some way perhaps you'd like to send in the pictures?