multiply-divide board 乘除板
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Brown and his board worked out a plan to divide Motorola in two.
FORBES: The Other Motorola
Unable to read and write, Goodfellow nonetheless had an intuitive understanding of math, and one day a schoolteacher caught him trying to divide the likes of 1, 453 by 28 on a slate board in the corner of the room.
FORBES: The Reductive Outsider
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