diff --git a/src/PhpSpreadsheet/Calculation/Engineering.php b/src/PhpSpreadsheet/Calculation/Engineering.php
index 57116f28f5..319a2ed684 100644
--- a/src/PhpSpreadsheet/Calculation/Engineering.php
+++ b/src/PhpSpreadsheet/Calculation/Engineering.php
@@ -377,7 +377,7 @@ public static function BINTODEC($x)
             }
         }
         if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_GNUMERIC) {
-            $x = floor($x);
+            $x = floor((float) $x);
         }
         $x = (string) $x;
         if (strlen($x) > preg_match_all('/[01]/', $x, $out)) {
@@ -432,7 +432,7 @@ public static function BINTOHEX($x, $places = null)
             }
         }
         if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_GNUMERIC) {
-            $x = floor($x);
+            $x = floor((float) $x);
         }
         $x = (string) $x;
         if (strlen($x) > preg_match_all('/[01]/', $x, $out)) {
@@ -442,9 +442,9 @@ public static function BINTOHEX($x, $places = null)
             return Functions::NAN();
         } elseif (strlen($x) == 10) {
             //    Two's Complement
-            return str_repeat('F', 8) . substr(strtoupper(dechex(bindec(substr($x, -9)))), -2);
+            return str_repeat('F', 8) . substr(strtoupper(dechex((int) bindec(substr($x, -9)))), -2);
         }
-        $hexVal = (string) strtoupper(dechex(bindec($x)));
+        $hexVal = (string) strtoupper(dechex((int) bindec($x)));
 
         return self::nbrConversionFormat($hexVal, $places);
     }
@@ -485,7 +485,7 @@ public static function BINTOOCT($x, $places = null)
             }
         }
         if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_GNUMERIC) {
-            $x = floor($x);
+            $x = floor((float) $x);
         }
         $x = (string) $x;
         if (strlen($x) > preg_match_all('/[01]/', $x, $out)) {
@@ -495,9 +495,9 @@ public static function BINTOOCT($x, $places = null)
             return Functions::NAN();
         } elseif (strlen($x) == 10) {
             //    Two's Complement
-            return str_repeat('7', 7) . substr(strtoupper(decoct(bindec(substr($x, -9)))), -3);
+            return str_repeat('7', 7) . substr(strtoupper(decoct((int) bindec(substr($x, -9)))), -3);
         }
-        $octVal = (string) decoct(bindec($x));
+        $octVal = (string) decoct((int) bindec($x));
 
         return self::nbrConversionFormat($octVal, $places);
     }
@@ -546,7 +546,7 @@ public static function DECTOBIN($x, $places = null)
             return Functions::VALUE();
         }
 
-        $x = (string) floor($x);
+        $x = (int) floor((float) $x);
         if ($x < -512 || $x > 511) {
             return Functions::NAN();
         }
@@ -604,7 +604,7 @@ public static function DECTOHEX($x, $places = null)
         if (strlen($x) > preg_match_all('/[-0123456789.]/', $x, $out)) {
             return Functions::VALUE();
         }
-        $x = (string) floor($x);
+        $x = (int) floor((float) $x);
         $r = strtoupper(dechex($x));
         if (strlen($r) == 8) {
             //    Two's Complement
@@ -658,7 +658,7 @@ public static function DECTOOCT($x, $places = null)
         if (strlen($x) > preg_match_all('/[-0123456789.]/', $x, $out)) {
             return Functions::VALUE();
         }
-        $x = (string) floor($x);
+        $x = (int) floor((float) $x);
         $r = decoct($x);
         if (strlen($r) == 11) {
             //    Two's Complement
@@ -945,7 +945,7 @@ public static function OCTTOHEX($x, $places = null)
         if (preg_match_all('/[01234567]/', $x, $out) != strlen($x)) {
             return Functions::NAN();
         }
-        $hexVal = strtoupper(dechex(self::OCTTODEC($x)));
+        $hexVal = strtoupper(dechex((int) self::OCTTODEC((int) $x)));
 
         return self::nbrConversionFormat($hexVal, $places);
     }