What is the difference between area and perimeter? When do you write cm or cm-squared? These words and their underlying concepts continue to be a source of confusion to our students. This card game is designed to take your students away from worksheets by letting them use mental math as they discuss key vocabulary and concepts with a partner. Included in this set are 30 cards: 10 rectangles, 10 area, and 10 perimeter; and yes - a square is a rectangle! You will love to hear your students using proper terminology as they exercise mental computation and master the concepts. This Common Core activity serves as excellent independent practice and review for all levels, and it is ideal for English Language learners. 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!"