Simmons, 40, was never great at math. His son, who is in third grade, had just failed a test ... from her retail job and saw the pair doing homework. She posted the photo on Facebook.

saying math in particular is a stumper, no matter how many years of education. "I know about the homework struggle," @dmuffley wrote. "My boy is in the 3rd grade and I'm googling for help!" ...

It performed well enough to get around a low B grade or a high C average on the homework ... now have a free app in their pocket that can walk them through various math problems in seconds ...

Man needed help with son’s third-grade math homework and got it from a stranger on the subway Felix and I spent the next half-hour engaged in a spirited discussion about the state of math ...