I made this set of eight cards about areas found by integration for my IB Standard Level students. The graphs are taken from a textbook exercise. (Screenshot below. Follow the link to get the cards.)
I wanted them to use several methods for finding the areas, including numeric and algebraic integration, so I presented these instructions.
With the answers displayed on the board, students could feel confident as they went through the cards.
This lesson really worked for my students. It was less boring than a textbook exercise, and allowed them to discriminate between methods for finding areas. It also provided good practice of integration and GDC skills.