Just what you were looking for! This Riemann Sum foldable helps your students explore Area under a curve and approximate areas with 9 examples organized for maximum understanding. The first page includes an example completed three ways showing the difference between Left Endpoint Sum, Midpoint Sum and Right Endpoint Sum methods. As students open the foldable fully, there are 6 more problems for them to complete, two different functions for which they find the sums three ways, Left Endpoint