What it is: Plus Happy Numbers is a free kindergarten through second-grade site with monthly math challenges. Teachers can sign up for a free classroom account and assign the monthly math challenge for students to solve. The challenges are designed to tap into higher-order thinking skills and build problem solving cognitive skills like visual spatial thinking. Students each receive their own login so that individual progress can be tracked and reported back to you. Plus Happy Numbers is designed to be used on any device that you have in your classroom including iPad and Mac (via Safari), Chromebook, PC and…