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OH NO! You are 500 feet below sea level and running out of air. You need to make it back to the surface as soon as possible. That means you need to subtract MENTALLY-no time to write down your work!
Students will spin then practicing subtracting 1, 2, 3, 4, 10, and 100 mentally while trying to be the first scuba diver to reach the surface. Play with a partner so students have a peer for support!