diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index af75d44b3aac8..7c7d6efa5872e 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Remove deprecated method `Numeric#to_formatted_s`
+
+    *Andrew White*
+
 *   Remove deprecated method `alias_method_chain`
 
     *Andrew White*
diff --git a/activesupport/lib/active_support/core_ext/numeric/conversions.rb b/activesupport/lib/active_support/core_ext/numeric/conversions.rb
index cebfda8d31b75..946f8ddeab739 100644
--- a/activesupport/lib/active_support/core_ext/numeric/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/numeric/conversions.rb
@@ -126,11 +126,6 @@ def to_s(*args)
       end
     end
   end
-
-  def to_formatted_s(*args)
-    to_s(*args)
-  end
-  deprecate to_formatted_s: :to_s
 end
 
 # Ruby 2.4+ unifies Fixnum & Bignum into Integer.
diff --git a/activesupport/test/core_ext/numeric_ext_test.rb b/activesupport/test/core_ext/numeric_ext_test.rb
index a6e5ea5ab7c27..19dc4e513688d 100644
--- a/activesupport/test/core_ext/numeric_ext_test.rb
+++ b/activesupport/test/core_ext/numeric_ext_test.rb
@@ -376,12 +376,6 @@ def test_to_s__injected_on_proper_types
     assert_equal "1 Million", BigDecimal("1000010").to_s(:human)
   end
 
-  def test_to_formatted_s_is_deprecated
-    assert_deprecated do
-      5551234.to_formatted_s(:phone)
-    end
-  end
-
   def test_to_s_with_invalid_formatter
     assert_equal "123", 123.to_s(:invalid)
     assert_equal "2.5", 2.5.to_s(:invalid)