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You need as many Post-its as problems you will give, a Sharpie marker, and a pencil. Write the the first problem on the front of a Post-it note at the start (maybe this one is a different color). Now write the answer on another Post-it with a new problem on the underneath (in pencil). Students have to work problems and then search for the answers. Great way to get students doing math and get them up and moving!

from Teachers Pay Teachers

Linear Equations Flippables

Could do something similar for integrated science and defining the variables for power, velocity etc.