# File lib/money/currency.rb, line 259
    def decimal_places
      if subunit_to_unit == 1
        0
      elsif subunit_to_unit % 10 == 0
        Math.log10(subunit_to_unit).to_s.to_i
      else
        Math.log10(subunit_to_unit).to_s.to_i+1
      end
    end