It's Mental Math Monday with math teacher Nick from Colorado! How would you mentally calculate 89 17? Let's see all of the different ways we think about this problem. | Learning Math with Howie Hua

This professor has won $700k for solving a 300-year-old math equation http://cnn.it/1RoHskg Editor's Note: The video displays the equation incorrectly. The "n" variables should be displayed as superscript. | CNN