1 files changed, 6 insertions, 4 deletions
diff --git a/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb b/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb
index 981c562551..cfcb0045fb 100644
--- a/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb
+++ b/activesupport/lib/active_support/number_helper/number_to_rounded_converter.rb
@@ -29,9 +29,11 @@ module ActiveSupport
 
           formatted_string =
             if BigDecimal === rounded_number && rounded_number.finite?
-              s = rounded_number.to_s('F') + '0'*precision
-              a, b = s.split('.', 2)
-              a + '.' + b[0, precision]
+              s = rounded_number.to_s("F")
+              s << "0".freeze * precision
+              a, b = s.split(".".freeze, 2)
+              a << ".".freeze
+              a << b[0, precision]
             else
               "%00.#{precision}f" % rounded_number
             end
@@ -72,7 +74,7 @@ module ActiveSupport
         def format_number(number)
           if strip_insignificant_zeros
             escaped_separator = Regexp.escape(options[:separator])
-            number.sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, '')
+            number.sub(/(#{escaped_separator})(\d*[1-9])?0+\z/, '\1\2').sub(/#{escaped_separator}\z/, "")
           else
             number
           end