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***bug fix being submitted to apple asap for some issues with showing leaderboard***
How fast can you subtract? The problems start out easy -- 3 minus 2, 5 minus 1, you have 30 seconds to answer as many as you can. Each correct answer adds an additional second to the clock. Every few questions the numbers you are
How fast can you subtract? The problems start out easy -- 3 minus 2, 5 minus 1, you have 30 seconds to answer as many as you can. Each correct answer adds an additional second to the clock. Every few questions the numbers you are
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