If there are nine people in a room and every person shakes hands exactly once with each of the other people, how many handshakes will there be? How can you prove your answer is correct using a model ...

Whether you have kids of your own or can recall to your childhood days, you know kids are very savvy when it comes to devising clever plans to achieve the outcomes they want in nearly every situation.

Problem solving is one of today’s top skills—students who apply problem-solving strategies in the classroom are building important talents for college and the workforce. The math classroom is one of ...

Solve one-step word problems using a visual model & a problem-solving process. Warm up with a Mystery Math Mistake to hunt for the mistake in adding two 2-digit numbers using a decomposition strategy.