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Calculators

Calculators for questions that are easy to get slightly wrong: five percentage questions solved exactly, whichever box is left empty, with the working shown; the days or working days between two dates, with your own weekend and holidays, and an age to the day; and one time in every city at once, with a warning when a clock change moves the gap between two of them before your meeting. Beside them, timers and a stopwatch for the desk.

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