Rather than simply define terms like "factors", "prime" and "composite"... why not actually *SEE* the terms in action! This unique and engaging activity allows students to see the concepts as they "stack" the factors of the numbers from 1 - 36. Let's dig deeper - how many factors do these numbers have? Why do some numbers have an even number of factors, while others have an odd number of factors? What does it mean for a number to be deficient? Abundant? Perfect? What starts as a simple l