diff --git a/core/modules/number/lib/Drupal/number/Plugin/field/field_type/DecimalItem.php b/core/modules/number/lib/Drupal/number/Plugin/field/field_type/DecimalItem.php
index 5b9173b..c20b746 100644
--- a/core/modules/number/lib/Drupal/number/Plugin/field/field_type/DecimalItem.php
+++ b/core/modules/number/lib/Drupal/number/Plugin/field/field_type/DecimalItem.php
@@ -97,10 +97,7 @@ public function settingsForm(array $form, array &$form_state) {
    * {@inheritdoc}
    */
   public function preSave() {
-    $this->setValue(
-      round($this->get('value')->getValue(),
-      $this->getInstance()->getField()->settings['scale'])
-    );
+    $this->value = round($this->value, $this->getInstance()->getField()->settings['scale']);
   }
 
 }
diff --git a/core/modules/number/lib/Drupal/number/Plugin/field/field_type/NumberItemBase.php b/core/modules/number/lib/Drupal/number/Plugin/field/field_type/NumberItemBase.php
index 3015c4b..58f9172 100644
--- a/core/modules/number/lib/Drupal/number/Plugin/field/field_type/NumberItemBase.php
+++ b/core/modules/number/lib/Drupal/number/Plugin/field/field_type/NumberItemBase.php
@@ -64,8 +64,7 @@ public function instanceSettingsForm(array $form, array &$form_state) {
    * {@inheritdoc}
    */
   public function isEmpty() {
-    $value = $this->get('value')->getValue();
-    if (empty($value) && (string) $value !== '0') {
+    if (empty($this->value) && (string) $this->value !== '0') {
       return TRUE;
     }
     return FALSE;