FAMILY FUN
To Find a Number Thought of. — This is an arithmetical puzzle which, to those who are unacquainted with it, seems very surprising; but, when explained, it is very simple. There are various methods, of which the following is an example: —Ask a person to think of any number under 10; when he says he has done so, request him to multiply it by 3, add 1, multiply by 3, add to this fche number thought of. Let him inform you what is the number produced; it will end with 3. Strike off the 3, and inform him that he thought of the remaining number.
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https://paperspast.natlib.govt.nz/periodicals/NZT19110907.2.74.9
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New Zealand Tablet, 7 September 1911, Page 1774
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106FAMILY FUN New Zealand Tablet, 7 September 1911, Page 1774
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