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The Answer Pad.  Teachers $10.00 + 1.00 per student.  Worth every penny!  The Answer Pad app offers teachers a seamless, easy-to-use platform to interact with students.  The Go Interactive feature provides 6 different ways to check for  a student's understanding. The Draw feature allows students to draw their answer or annote on many templates, such as graph paper.  Teachers can also upload their own custom graphics.  The Answer Pad scores your paper quizzes for you.  The Answer Pad is ideal for any classroom!

Plickers is a classroom response app that teachers can use very easily without having devices for each student.  Each student is given a card (which the teacher prints off) with a unique visual code.  The code has 4 sides: A, B,C,D.  The student holds the card so that the letter they choose to answer the question is at the tope of their card.  Teachers make their set of questions at plickers.com

Free.  Students share their understanding by answering formative assessment questions in a variety of formats: quizzes (MC, T/F, open-ended questions), on the fly questions, exit tickets and space races.  Once students launch the Socrative Student App, they will be prompted to join the teacher's room via the teacher's unique code.  No student accounts necessary!