diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/NumberWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/NumberWidget.php
index b4fac537..817a5318 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/NumberWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/NumberWidget.php
@@ -78,7 +78,8 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
     // Set the step for floating point and decimal numbers.
     switch ($this->fieldDefinition->getType()) {
       case 'decimal':
-        $element['#step'] = pow(0.1, $field_settings['scale']);
+        //The number_format() function formats a number with grouped thousands.
+        $element['#step'] = number_format(pow(0.1, $field_settings['scale']), $field_settings['scale'], '.', '');
         break;
 
       case 'float':