refactor number helper

activesupport/lib/active_support/number_helper.rb

@@ -295,7 +295,7 @@ def number_to_delimited(number, options = {})
 
       options = format_options(options[:locale]).merge!(options)
 
-      parts = number.to_s.to_str.split('.')
+      parts = number.to_s.split('.')
       parts[0].gsub!(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{options[:delimiter]}")
       parts.join(options[:separator])
     end
@@ -356,7 +356,8 @@ def number_to_rounded(number, options = {})
           digits, rounded_number = 1, 0
         else
           digits = (Math.log10(number.abs) + 1).floor
-          rounded_number = (BigDecimal.new(number.to_s) / BigDecimal.new((10 ** (digits - precision)).to_f.to_s)).round.to_f * 10 ** (digits - precision)
+          multiplier = 10 ** (digits - precision)
+          rounded_number = (BigDecimal.new(number.to_s) / BigDecimal.new(multiplier.to_f.to_s)).round.to_f * multiplier
           digits = (Math.log10(rounded_number.abs) + 1).floor # After rounding, the number of digits may have changed
         end
         precision -= digits