diff --git a/class/Tasks/NumberConversionTask.php b/class/Tasks/NumberConversionTask.php
index 8afc0c8..f7404b8 100644
--- a/class/Tasks/NumberConversionTask.php
+++ b/class/Tasks/NumberConversionTask.php
@@ -105,10 +105,11 @@ class NumberConversionTask extends OpenEndedTask
     public function staticCheck(): void
     {
         $mark = 0.0;
+        $pa = strtolower($this->player_answer);
         if ($this->hasFlag("acceptwithoutleadingzeros")) {
-            $mark = (ltrim($this->player_answer, " 0") === ltrim($this->correct_answer, "0")) ? $this->getMaxMark() : 0.0;
+            $mark = (ltrim($pa, " 0") === ltrim($this->correct_answer, "0")) ? $this->getMaxMark() : 0.0;
         } else {
-            $mark = (trim($this->player_answer) === trim($this->correct_answer)) ? $this->getMaxMark() : 0.0;
+            $mark = (trim($pa) === trim($this->correct_answer)) ? $this->getMaxMark() : 0.0;
         }
         $this->setMark($mark);
     }