This digital, self-checking activity is perfect for 4th grade students learning how to identify types of angles as acute, obtuse and right. With 3 self-grading activities, students will master this geometry skill. This works well as math stations, centers, rotations, homework, or as an order of operations challenge activity for your early and fast finishers! How does the self-checking aspect work?When students type in their answers, the self-checking feature will cause one of two things to hap