One worksheet with two problems for each topic lesson. Instead of having your students fill out endless __+__=__problems without really knowing what their thought process is, these problems have them show, in multiple ways, their understanding of the concept. I have used them with my students and they work! After they complete their work, they have two partners check their answer and steps (and initial when they agree!) before the teacher sees it. It creates a deeper sense of understanding the standards and the ability to show work in several different ways, as well as teamwork to help each other. If there is interest I will create them for other topics as well!