rounding - In Ruby how do you round down a number to 2 significant digits -

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For example,

If I have 24 9 8 9 54, I would return 24 million Need, is it possible?

Here's a greasy algorithm: 

  n = 24987654 n / (10 ** (n.to_s.size - 2)) * (10 ** (n.to_s.size - 2) => 24000000

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