As an extension you could have them look at a die and its dot pattern. My campus uses a curriculum by the name of Sharon Wells. What you do is you call out a number, say 6. You start counting on your right thumb and you say one, count on your left thumb and say two, count on your right index finger and say three, count on your left index finger and say four continue in this manner until you get to the desired number. When you have reached the number, put hands together and see if every finger has a partner.
Students really get to understand the concept.
I hope you understood the directions and most of all I hope it helps you in your lesson. I have mine shout the even numbers and whisper the odd numbers to help them see the pattern at first.