A Fermi Problem is a type of math problem that helps you estimate a number. It goes something like this: "If we take a guess at how many rocks are in this jar, can you tell me if we are close?"
To solve a Fermi Problem, you will need to break it down into smaller questions and then use math to figure out the answer. For example, you could ask how many rocks are in each group (larger, medium, and small), how many groups are there, and how many rocks are in each group. Then you can multiply the number of groups by the number of rocks in each group to get your estimate of how many rocks are in the jar.