Steve sang a song so bad it made 10 students laugh. Each of those 10 students made 10 other students laugh. If Steve was laughing at himself too, how many students, including Steve, were laughing by the end?

111 students.

Step-by-step explanation:

If each of the 10 students made 10 other students laugh then 10 students x 10 students = 100 additional students. If you add the 100 additional students, the 10 original students, and Steve, you get 111 laughing students in total.