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Mathematical Recreation.
Example.
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Another way to find what number was thought upon.
BId him which thinketh double his Number, and unto that double add 4, and bid him multiply that ſame product by 5, and unto that product bid him add 12, and multiply that laſt number by 10 (which is done eaſily by ſetting a Cypher at the end of the number) then as him the laſt number or product, and from it ſecretly ſubtract 320; the remainder in the hundreth place is the number thought upon.
Example.
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