Here are a couple of great resources that will help students visualize very large numbers.
One is a book written for early elementary ages called How Big is a Million? published by Usborne. It gives a simple illustration about understanding large numbers that young children can grasp. It comes with a poster to further help children visualize what a million looks like.
And for older students, we recently found a very interesting website called the MegaPenny Project that shows large numbers by using stacks of pennies. The first image is one single penny and by the time you get to the end of the illustrations, you are at a Quintillion. While we will, in all likelihood, never actually have to use a number that big, it’s still quite fascinating to see the stacks of pennies grow to that enormous number.
Have you found other sources that help with this concept? I’d love to hear about them.