Try grouping the dominoes in the ways described. Are there any left over each time? Can you explain why?

Sort the houses in my street into different groups. Can you do it in any other ways?

In this problem, we're going to find sets of letter shapes that go together.

Sorting Numbers

Numbers can be sorted in many different ways. We are just going to be using the numbers from 0 to 50.

In this box there is a set of numbers:

They are the odd numbers between 20 and 40.

In this box there is a different set of numbers:

They are multiples of five.

Now you can make your own sets. Think of a good title for each of your sets.