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Starting with any number at all, I can always reduce it to 4 by applying a consistent rule. Find out what is the rule?

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Starting with any number at all, I can always reduce it to 4 by applying a consistent rule. 4 is the magic number.
Example: 100. 100 is 10, 10 is 3, 3 is 5, 5 is 4, and 4 is the magic number.
Another Example: 52. 52 is 8, 8 is 5, 5 is 4, 4 is the magic number.
Find out what is the rule?

posted Aug 10, 2017 by Naveen Kumar

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