Here’s an example of a division problem: Compute .
And here’s a horrible way to solve it: Draw a picture of dots on a page and then circle groups of twelve dots. You will see, after about an hour, that there are groups of twelve in a picture of .
Here’s a great way to solve it: Draw a picture of dots in a machine and just see right away that there are groups of twelve in it!
Read and play on to see how we can do this!