What is the difference between complementary and supplementary angles? After your students complete this activity, they will be able to give you a clear response! These flash cards are a wonderful way for your students to master the concept, without using another worksheet. You can provide scratch paper, but hopefully students will be able to use and strengthen their mental math skills as they find the missing angles. After matching each angle, students must choose the proper descriptive term – an activity that strengthens their use of academic vocabulary. This set includes 60 cards, including 10 complementary angles, 10 supplementary angles, the matching angle values and labels, and an answer key. You will love to hear your students using proper terminology as they exercise mental computation and master the concepts. This activity is ideal for English Language learners, and it complements your Common Core program. Whether you use these cards as a center or whole class project, your students will be engaged as they learn in this kinesthetic activity. - from Judy Seki for "Math in a Flash!"