We added this Angle-Maker to our math notebooks. We copied and cut it out of card stock and added hands with a brad. Students can quickly make angles of specific measures. It's an easy formative assessment to ask students to make a 90* or 45* angle, for example. I can quickly see if they have the idea. I can ask for various classifications of angle - right, obtuse, acute - and students can hold up their notebook for me to see. Partners can challenge each other to make or label their own angles.