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Mathematical calculations come up frequently in day-to-day life, and there is a lot of benefit to being able to tackle a problem without resorting to a calculator. Whether you're short for time in an exam or just calculating the tip at a
Mathematical calculations come up frequently in day-to-day life, and there is a lot of benefit to being able to tackle a problem without resorting to a calculator. Whether you're short for time in an exam or just calculating the tip at a
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