15 different brain teasers that are great for classes of all ages. These math riddles involve games, challenges, spacial reasoning, critical thinking, and basic math skills, which will generate great conversation and interaction. These challenges are perfect for Bellringers, extra credit activities, group tasks, or any time you have some extra time and want to have some fun while still being academic.The download is a PPT presentation, each challenge is on its own slide with the answers immediat