# Numbers

Here is a set of very educational paper toys: The numbers from 1 to 10. Not just simple numbers, though – these come with a trick: Each number has a length proportional to it’s numeric value. So two is double the length of one, three is 1.5 times longer than two, and so on.

That means that it’s very easy to do math with these numbers, in particular subtractions and additions. It’s so easy, in fact, that my 3 year old son (who knows what the numbers look like, but can’t actually add or subtract) spontaneously started doing math with them.