diff --git a/samples/bulkReadTest.php b/samples/bulkReadTest.php
new file mode 100644
index 00000000..2f94d420
--- /dev/null
+++ b/samples/bulkReadTest.php
@@ -0,0 +1,38 @@
+<?php
+
+// The following code can be used to submit an issue with the PHPSpreadsheet calculation engine
+
+use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
+use PhpOffice\PhpSpreadsheet\IOFactory;
+
+error_reporting(E_ALL);
+set_time_limit(0);
+
+date_default_timezone_set('UTC');
+
+// Adjust the path as required to reference the PHPSpreadsheet Bootstrap file
+require_once __DIR__ . '/../vendor/autoload.php';
+
+foreach (glob(__DIR__ . '/*') as $fileName) {
+    if (!in_array(pathinfo($fileName, PATHINFO_EXTENSION), ['xls', 'xlsx', 'gnumeric', 'ods'])) {
+        continue;
+    }
+    $callStartTime = microtime(true);
+    echo 'Current memory usage: ' , (memory_get_usage(true) / 1024) , ' KB' , PHP_EOL;
+    $spreadsheet = IOFactory::load($fileName);
+    echo 'Loaded spreadsheet file ', pathinfo($fileName, PATHINFO_FILENAME), PHP_EOL;
+    $callEndTime = microtime(true);
+    $loadCallTime = $callEndTime - $callStartTime;
+    echo 'Call time to load spreadsheet file was ' , sprintf('%.4f', $loadCallTime) , ' seconds' , PHP_EOL;
+    echo 'Current memory usage: ' , (memory_get_usage(true) / 1024) , ' KB' , PHP_EOL;
+    $spreadsheet->disconnectWorksheets();
+    $spreadsheet->garbageCollect();
+    unset($spreadsheet);
+    echo 'Unset Spreadsheet', PHP_EOL;
+    gc_collect_cycles();
+    echo 'Memory usage after unset: ' , (memory_get_usage(true) / 1024) , ' KB' , PHP_EOL;
+}
+
+// Echo memory usage
+echo ' Current memory usage: ' , (memory_get_usage(true) / 1024) , ' KB' , PHP_EOL;
+echo '    Peak memory usage: ' , (memory_get_peak_usage(true) / 1024) , ' KB' , PHP_EOL;
diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index 36ce3c54..36381dbe 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -993,12 +993,12 @@ class Calculation
         ],
         'FACT' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Fact::class, 'evaluate'],
+            'functionCall' => [MathTrig\Factorial::class, 'fact'],
             'argumentCount' => '1',
         ],
         'FACTDOUBLE' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\FactDouble::class, 'evaluate'],
+            'functionCall' => [MathTrig\Factorial::class, 'factDouble'],
             'argumentCount' => '1',
         ],
         'FALSE' => [
@@ -1729,12 +1729,12 @@ class Calculation
         ],
         'MROUND' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Mround::class, 'evaluate'],
+            'functionCall' => [MathTrig\Round::class, 'multiple'],
             'argumentCount' => '2',
         ],
         'MULTINOMIAL' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Multinomial::class, 'evaluate'],
+            'functionCall' => [MathTrig\Factorial::class, 'multinomial'],
             'argumentCount' => '1+',
         ],
         'MUNIT' => [
@@ -2046,7 +2046,7 @@ class Calculation
         ],
         'RAND' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Random::class, 'randNoArgs'],
+            'functionCall' => [MathTrig\Random::class, 'rand'],
             'argumentCount' => '0',
         ],
         'RANDARRAY' => [
@@ -2116,17 +2116,17 @@ class Calculation
         ],
         'ROUND' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\Round::class, 'evaluate'],
+            'functionCall' => [MathTrig\Round::class, 'round'],
             'argumentCount' => '2',
         ],
         'ROUNDDOWN' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\RoundDown::class, 'evaluate'],
+            'functionCall' => [MathTrig\Round::class, 'down'],
             'argumentCount' => '2',
         ],
         'ROUNDUP' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\RoundUp::class, 'evaluate'],
+            'functionCall' => [MathTrig\Round::class, 'up'],
             'argumentCount' => '2',
         ],
         'ROW' => [
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig.php b/src/PhpSpreadsheet/Calculation/MathTrig.php
index 903178cc..d7e1a66f 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig.php
@@ -184,16 +184,16 @@ class MathTrig
      *
      * @Deprecated 1.18.0
      *
-     * @see MathTrig\Fact::evaluate()
-     *      Use the evaluate() method in the MathTrig\Fact class instead
-     *
      * @param float $factVal Factorial Value
      *
      * @return float|int|string Factorial, or a string containing an error
+     *
+     *@see MathTrig\Factorial::fact()
+     *      Use the fact() method in the MathTrig\Factorial class instead
      */
     public static function FACT($factVal)
     {
-        return MathTrig\Fact::evaluate($factVal);
+        return MathTrig\Factorial::fact($factVal);
     }
 
     /**
@@ -206,16 +206,16 @@ class MathTrig
      *
      * @Deprecated 1.18.0
      *
-     * @see MathTrig\FactDouble::evaluate()
-     *      Use the evaluate() method in the MathTrig\FactDouble class instead
-     *
      * @param float $factVal Factorial Value
      *
      * @return float|int|string Double Factorial, or a string containing an error
+     *
+     *@see MathTrig\Factorial::factDouble()
+     *      Use the factDouble() method in the MathTrig\Factorial class instead
      */
     public static function FACTDOUBLE($factVal)
     {
-        return MathTrig\FactDouble::evaluate($factVal);
+        return MathTrig\Factorial::factDouble($factVal);
     }
 
     /**
@@ -469,17 +469,17 @@ class MathTrig
      *
      * @Deprecated 1.17.0
      *
-     * @see MathTrig\Mround::evaluate()
-     *      Use the evaluate() method in the MathTrig\Mround class instead
-     *
      * @param float $number Number to round
      * @param int $multiple Multiple to which you want to round $number
      *
      * @return float|string Rounded Number, or a string containing an error
+     *
+     *@see MathTrig\Round::multiple()
+     *      Use the multiple() method in the MathTrig\Mround class instead
      */
     public static function MROUND($number, $multiple)
     {
-        return MathTrig\Mround::evaluate($number, $multiple);
+        return MathTrig\Round::multiple($number, $multiple);
     }
 
     /**
@@ -489,8 +489,8 @@ class MathTrig
      *
      * @Deprecated 1.18.0
      *
-     * @See MathTrig\Multinomial::evaluate()
-     *      Use the evaluate method in the MathTrig\Multinomial class instead
+     * @See MathTrig\Factorial::multinomial()
+     *      Use the multinomial method in the MathTrig\Factorial class instead
      *
      * @param mixed[] $args An array of mixed values for the Data Series
      *
@@ -498,7 +498,7 @@ class MathTrig
      */
     public static function MULTINOMIAL(...$args)
     {
-        return MathTrig\Multinomial::evaluate(...$args);
+        return MathTrig\Factorial::multinomial(...$args);
     }
 
     /**
@@ -631,8 +631,8 @@ class MathTrig
      *
      * @Deprecated 1.17.0
      *
-     * @See MathTrig\RoundUp::evaluate()
-     *      Use the evaluate() method in the MathTrig\RoundUp class instead
+     * @See MathTrig\Round::up()
+     *      Use the up() method in the MathTrig\Round class instead
      *
      * @param float $number Number to round
      * @param int $digits Number of digits to which you want to round $number
@@ -641,7 +641,7 @@ class MathTrig
      */
     public static function ROUNDUP($number, $digits)
     {
-        return MathTrig\RoundUp::evaluate($number, $digits);
+        return MathTrig\Round::up($number, $digits);
     }
 
     /**
@@ -651,8 +651,8 @@ class MathTrig
      *
      * @Deprecated 1.17.0
      *
-     * @See MathTrig\RoundDown::evaluate()
-     *      Use the evaluate() method in the MathTrig\RoundDown class instead
+     * @See MathTrig\Round::down()
+     *      Use the down() method in the MathTrig\Round class instead
      *
      * @param float $number Number to round
      * @param int $digits Number of digits to which you want to round $number
@@ -661,7 +661,7 @@ class MathTrig
      */
     public static function ROUNDDOWN($number, $digits)
     {
-        return MathTrig\RoundDown::evaluate($number, $digits);
+        return MathTrig\Round::down($number, $digits);
     }
 
     /**
@@ -1124,8 +1124,8 @@ class MathTrig
      *
      * @Deprecated 1.17.0
      *
-     * @See MathTrig\Round::evaluate()
-     *      Use the evaluate() method in the MathTrig\Round class instead
+     * @See MathTrig\Round::round()
+     *      Use the round() method in the MathTrig\Round class instead
      *
      * @param mixed $number Should be numeric
      * @param mixed $precision Should be int
@@ -1134,7 +1134,7 @@ class MathTrig
      */
     public static function builtinROUND($number, $precision)
     {
-        return MathTrig\Round::evaluate($number, $precision);
+        return MathTrig\Round::round($number, $precision);
     }
 
     /**
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Combinations.php b/src/PhpSpreadsheet/Calculation/MathTrig/Combinations.php
index 7e7b26ee..2a0cbdfd 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Combinations.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Combinations.php
@@ -31,7 +31,7 @@ class Combinations
             return $e->getMessage();
         }
 
-        return round(Fact::evaluate($numObjs) / Fact::evaluate($numObjs - $numInSet)) / Fact::evaluate($numInSet);
+        return round(Factorial::fact($numObjs) / Factorial::fact($numObjs - $numInSet)) / Factorial::fact($numInSet);
     }
 
     /**
@@ -69,6 +69,6 @@ class Combinations
             return $e->getMessage();
         }
 
-        return round(Fact::evaluate($numObjs + $numInSet - 1) / Fact::evaluate($numObjs - 1)) / Fact::evaluate($numInSet);
+        return round(Factorial::fact($numObjs + $numInSet - 1) / Factorial::fact($numObjs - 1)) / Factorial::fact($numInSet);
     }
 }
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Fact.php b/src/PhpSpreadsheet/Calculation/MathTrig/Fact.php
deleted file mode 100644
index 2aa3d349..00000000
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Fact.php
+++ /dev/null
@@ -1,47 +0,0 @@
-<?php
-
-namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-
-use Exception;
-use PhpOffice\PhpSpreadsheet\Calculation\Functions;
-use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
-
-class Fact
-{
-    /**
-     * FACT.
-     *
-     * Returns the factorial of a number.
-     * The factorial of a number is equal to 1*2*3*...* number.
-     *
-     * Excel Function:
-     *        FACT(factVal)
-     *
-     * @param float $factVal Factorial Value
-     *
-     * @return float|int|string Factorial, or a string containing an error
-     */
-    public static function evaluate($factVal)
-    {
-        try {
-            $factVal = Helpers::validateNumericNullBool($factVal);
-            Helpers::validateNotNegative($factVal);
-        } catch (Exception $e) {
-            return $e->getMessage();
-        }
-
-        $factLoop = floor($factVal);
-        if ($factVal > $factLoop) {
-            if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_GNUMERIC) {
-                return Statistical\Distributions\Gamma::gammaValue($factVal + 1);
-            }
-        }
-
-        $factorial = 1;
-        while ($factLoop > 1) {
-            $factorial *= $factLoop--;
-        }
-
-        return $factorial;
-    }
-}
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/FactDouble.php b/src/PhpSpreadsheet/Calculation/MathTrig/FactDouble.php
deleted file mode 100644
index 4b760144..00000000
--- a/src/PhpSpreadsheet/Calculation/MathTrig/FactDouble.php
+++ /dev/null
@@ -1,39 +0,0 @@
-<?php
-
-namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-
-use Exception;
-
-class FactDouble
-{
-    /**
-     * FACTDOUBLE.
-     *
-     * Returns the double factorial of a number.
-     *
-     * Excel Function:
-     *        FACTDOUBLE(factVal)
-     *
-     * @param float $factVal Factorial Value
-     *
-     * @return float|int|string Double Factorial, or a string containing an error
-     */
-    public static function evaluate($factVal)
-    {
-        try {
-            $factVal = Helpers::validateNumericNullSubstitution($factVal, 0);
-            Helpers::validateNotNegative($factVal);
-        } catch (Exception $e) {
-            return $e->getMessage();
-        }
-
-        $factLoop = floor($factVal);
-        $factorial = 1;
-        while ($factLoop > 1) {
-            $factorial *= $factLoop;
-            $factLoop -= 2;
-        }
-
-        return $factorial;
-    }
-}
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Factorial.php b/src/PhpSpreadsheet/Calculation/MathTrig/Factorial.php
new file mode 100644
index 00000000..f443f8e5
--- /dev/null
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Factorial.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
+
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Functions;
+use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
+
+class Factorial
+{
+    /**
+     * FACT.
+     *
+     * Returns the factorial of a number.
+     * The factorial of a number is equal to 1*2*3*...* number.
+     *
+     * Excel Function:
+     *        FACT(factVal)
+     *
+     * @param float $factVal Factorial Value
+     *
+     * @return float|int|string Factorial, or a string containing an error
+     */
+    public static function fact($factVal)
+    {
+        try {
+            $factVal = Helpers::validateNumericNullBool($factVal);
+            Helpers::validateNotNegative($factVal);
+        } catch (Exception $e) {
+            return $e->getMessage();
+        }
+
+        $factLoop = floor($factVal);
+        if ($factVal > $factLoop) {
+            if (Functions::getCompatibilityMode() == Functions::COMPATIBILITY_GNUMERIC) {
+                return Statistical\Distributions\Gamma::gammaValue($factVal + 1);
+            }
+        }
+
+        $factorial = 1;
+        while ($factLoop > 1) {
+            $factorial *= $factLoop--;
+        }
+
+        return $factorial;
+    }
+
+    /**
+     * FACTDOUBLE.
+     *
+     * Returns the double factorial of a number.
+     *
+     * Excel Function:
+     *        FACTDOUBLE(factVal)
+     *
+     * @param float $factVal Factorial Value
+     *
+     * @return float|int|string Double Factorial, or a string containing an error
+     */
+    public static function factDouble($factVal)
+    {
+        try {
+            $factVal = Helpers::validateNumericNullSubstitution($factVal, 0);
+            Helpers::validateNotNegative($factVal);
+        } catch (Exception $e) {
+            return $e->getMessage();
+        }
+
+        $factLoop = floor($factVal);
+        $factorial = 1;
+        while ($factLoop > 1) {
+            $factorial *= $factLoop;
+            $factLoop -= 2;
+        }
+
+        return $factorial;
+    }
+
+    /**
+     * MULTINOMIAL.
+     *
+     * Returns the ratio of the factorial of a sum of values to the product of factorials.
+     *
+     * @param mixed[] $args An array of mixed values for the Data Series
+     *
+     * @return float|string The result, or a string containing an error
+     */
+    public static function multinomial(...$args)
+    {
+        $summer = 0;
+        $divisor = 1;
+
+        try {
+            // Loop through arguments
+            foreach (Functions::flattenArray($args) as $argx) {
+                $arg = Helpers::validateNumericNullSubstitution($argx, null);
+                Helpers::validateNotNegative($arg);
+                $arg = (int) $arg;
+                $summer += $arg;
+                $divisor *= self::fact($arg);
+            }
+        } catch (Exception $e) {
+            return $e->getMessage();
+        }
+
+        $summer = self::fact($summer);
+
+        return $summer / $divisor;
+    }
+}
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Mround.php b/src/PhpSpreadsheet/Calculation/MathTrig/Mround.php
deleted file mode 100644
index 5f3c4c05..00000000
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Mround.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php
-
-namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-
-use Exception;
-use PhpOffice\PhpSpreadsheet\Calculation\Functions;
-
-class Mround
-{
-    /**
-     * MROUND.
-     *
-     * Rounds a number to the nearest multiple of a specified value
-     *
-     * @param mixed $number Expect float. Number to round.
-     * @param mixed $multiple Expect int. Multiple to which you want to round.
-     *
-     * @return float|string Rounded Number, or a string containing an error
-     */
-    public static function evaluate($number, $multiple)
-    {
-        try {
-            $number = Helpers::validateNumericNullSubstitution($number, 0);
-            $multiple = Helpers::validateNumericNullSubstitution($multiple, null);
-        } catch (Exception $e) {
-            return $e->getMessage();
-        }
-
-        if ($number == 0 || $multiple == 0) {
-            return 0;
-        }
-        if ((Helpers::returnSign($number)) == (Helpers::returnSign($multiple))) {
-            $multiplier = 1 / $multiple;
-
-            return round($number * $multiplier) / $multiplier;
-        }
-
-        return Functions::NAN();
-    }
-}
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Multinomial.php b/src/PhpSpreadsheet/Calculation/MathTrig/Multinomial.php
deleted file mode 100644
index 98b7d522..00000000
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Multinomial.php
+++ /dev/null
@@ -1,41 +0,0 @@
-<?php
-
-namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-
-use Exception;
-use PhpOffice\PhpSpreadsheet\Calculation\Functions;
-
-class Multinomial
-{
-    /**
-     * MULTINOMIAL.
-     *
-     * Returns the ratio of the factorial of a sum of values to the product of factorials.
-     *
-     * @param mixed[] $args An array of mixed values for the Data Series
-     *
-     * @return float|string The result, or a string containing an error
-     */
-    public static function evaluate(...$args)
-    {
-        $summer = 0;
-        $divisor = 1;
-
-        try {
-            // Loop through arguments
-            foreach (Functions::flattenArray($args) as $argx) {
-                $arg = Helpers::validateNumericNullSubstitution($argx, null);
-                Helpers::validateNotNegative($arg);
-                $arg = (int) $arg;
-                $summer += $arg;
-                $divisor *= Fact::evaluate($arg);
-            }
-        } catch (Exception $e) {
-            return $e->getMessage();
-        }
-
-        $summer = Fact::evaluate($summer);
-
-        return $summer / $divisor;
-    }
-}
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Random.php b/src/PhpSpreadsheet/Calculation/MathTrig/Random.php
index 1a384fe9..0c7acf91 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Random.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Random.php
@@ -11,7 +11,7 @@ class Random
      *
      * @return float Random number
      */
-    public static function randNoArgs()
+    public static function rand()
     {
         return (mt_rand(0, 10000000)) / 10000000;
     }
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Round.php b/src/PhpSpreadsheet/Calculation/MathTrig/Round.php
index a6552321..b5a2c305 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Round.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Round.php
@@ -2,7 +2,8 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class Round
 {
@@ -16,7 +17,7 @@ class Round
      *
      * @return float|string Rounded number
      */
-    public static function evaluate($number, $precision)
+    public static function round($number, $precision)
     {
         try {
             $number = Helpers::validateNumericNullBool($number);
@@ -27,4 +28,95 @@ class Round
 
         return round($number, (int) $precision);
     }
+
+    /**
+     * ROUNDUP.
+     *
+     * Rounds a number up to a specified number of decimal places
+     *
+     * @param float $number Number to round
+     * @param int $digits Number of digits to which you want to round $number
+     *
+     * @return float|string Rounded Number, or a string containing an error
+     */
+    public static function up($number, $digits)
+    {
+        try {
+            $number = Helpers::validateNumericNullBool($number);
+            $digits = (int) Helpers::validateNumericNullSubstitution($digits, null);
+        } catch (Exception $e) {
+            return $e->getMessage();
+        }
+
+        if ($number == 0.0) {
+            return 0.0;
+        }
+
+        if ($number < 0.0) {
+            return round($number - 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_DOWN);
+        }
+
+        return round($number + 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_DOWN);
+    }
+
+    /**
+     * ROUNDDOWN.
+     *
+     * Rounds a number down to a specified number of decimal places
+     *
+     * @param float $number Number to round
+     * @param int $digits Number of digits to which you want to round $number
+     *
+     * @return float|string Rounded Number, or a string containing an error
+     */
+    public static function down($number, $digits)
+    {
+        try {
+            $number = Helpers::validateNumericNullBool($number);
+            $digits = (int) Helpers::validateNumericNullSubstitution($digits, null);
+        } catch (Exception $e) {
+            return $e->getMessage();
+        }
+
+        if ($number == 0.0) {
+            return 0.0;
+        }
+
+        if ($number < 0.0) {
+            return round($number + 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_UP);
+        }
+
+        return round($number - 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_UP);
+    }
+
+    /**
+     * MROUND.
+     *
+     * Rounds a number to the nearest multiple of a specified value
+     *
+     * @param mixed $number Expect float. Number to round.
+     * @param mixed $multiple Expect int. Multiple to which you want to round.
+     *
+     * @return float|string Rounded Number, or a string containing an error
+     */
+    public static function multiple($number, $multiple)
+    {
+        try {
+            $number = Helpers::validateNumericNullSubstitution($number, 0);
+            $multiple = Helpers::validateNumericNullSubstitution($multiple, null);
+        } catch (Exception $e) {
+            return $e->getMessage();
+        }
+
+        if ($number == 0 || $multiple == 0) {
+            return 0;
+        }
+        if ((Helpers::returnSign($number)) == (Helpers::returnSign($multiple))) {
+            $multiplier = 1 / $multiple;
+
+            return round($number * $multiplier) / $multiplier;
+        }
+
+        return Functions::NAN();
+    }
 }
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/RoundDown.php b/src/PhpSpreadsheet/Calculation/MathTrig/RoundDown.php
deleted file mode 100644
index 0054a227..00000000
--- a/src/PhpSpreadsheet/Calculation/MathTrig/RoundDown.php
+++ /dev/null
@@ -1,38 +0,0 @@
-<?php
-
-namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-
-use Exception;
-
-class RoundDown
-{
-    /**
-     * ROUNDDOWN.
-     *
-     * Rounds a number down to a specified number of decimal places
-     *
-     * @param float $number Number to round
-     * @param int $digits Number of digits to which you want to round $number
-     *
-     * @return float|string Rounded Number, or a string containing an error
-     */
-    public static function evaluate($number, $digits)
-    {
-        try {
-            $number = Helpers::validateNumericNullBool($number);
-            $digits = (int) Helpers::validateNumericNullSubstitution($digits, null);
-        } catch (Exception $e) {
-            return $e->getMessage();
-        }
-
-        if ($number == 0.0) {
-            return 0.0;
-        }
-
-        if ($number < 0.0) {
-            return round($number + 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_UP);
-        }
-
-        return round($number - 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_UP);
-    }
-}
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/RoundUp.php b/src/PhpSpreadsheet/Calculation/MathTrig/RoundUp.php
deleted file mode 100644
index 6b2e6d1a..00000000
--- a/src/PhpSpreadsheet/Calculation/MathTrig/RoundUp.php
+++ /dev/null
@@ -1,38 +0,0 @@
-<?php
-
-namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-
-use Exception;
-
-class RoundUp
-{
-    /**
-     * ROUNDUP.
-     *
-     * Rounds a number up to a specified number of decimal places
-     *
-     * @param float $number Number to round
-     * @param int $digits Number of digits to which you want to round $number
-     *
-     * @return float|string Rounded Number, or a string containing an error
-     */
-    public static function evaluate($number, $digits)
-    {
-        try {
-            $number = Helpers::validateNumericNullBool($number);
-            $digits = (int) Helpers::validateNumericNullSubstitution($digits, null);
-        } catch (Exception $e) {
-            return $e->getMessage();
-        }
-
-        if ($number == 0.0) {
-            return 0.0;
-        }
-
-        if ($number < 0.0) {
-            return round($number - 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_DOWN);
-        }
-
-        return round($number + 0.5 * 0.1 ** $digits, $digits, PHP_ROUND_HALF_DOWN);
-    }
-}
diff --git a/src/PhpSpreadsheet/Calculation/Statistical/Distributions/Poisson.php b/src/PhpSpreadsheet/Calculation/Statistical/Distributions/Poisson.php
index 3456efcc..e7252e02 100644
--- a/src/PhpSpreadsheet/Calculation/Statistical/Distributions/Poisson.php
+++ b/src/PhpSpreadsheet/Calculation/Statistical/Distributions/Poisson.php
@@ -42,12 +42,12 @@ class Poisson
             $summer = 0;
             $floor = floor($value);
             for ($i = 0; $i <= $floor; ++$i) {
-                $summer += $mean ** $i / MathTrig\Fact::evaluate($i);
+                $summer += $mean ** $i / MathTrig\Factorial::fact($i);
             }
 
             return exp(0 - $mean) * $summer;
         }
 
-        return (exp(0 - $mean) * $mean ** $value) / MathTrig\Fact::evaluate($value);
+        return (exp(0 - $mean) * $mean ** $value) / MathTrig\Factorial::fact($value);
     }
 }
diff --git a/src/PhpSpreadsheet/Calculation/Statistical/Permutations.php b/src/PhpSpreadsheet/Calculation/Statistical/Permutations.php
index ab2e14dd..0bad2a88 100644
--- a/src/PhpSpreadsheet/Calculation/Statistical/Permutations.php
+++ b/src/PhpSpreadsheet/Calculation/Statistical/Permutations.php
@@ -38,7 +38,7 @@ class Permutations
             return Functions::NAN();
         }
 
-        return (int) round(MathTrig\Fact::evaluate($numObjs) / MathTrig\Fact::evaluate($numObjs - $numInSet));
+        return (int) round(MathTrig\Factorial::fact($numObjs) / MathTrig\Factorial::fact($numObjs - $numInSet));
     }
 
     /**
diff --git a/src/PhpSpreadsheet/Calculation/TextData/Format.php b/src/PhpSpreadsheet/Calculation/TextData/Format.php
index b360a0f6..d352c917 100644
--- a/src/PhpSpreadsheet/Calculation/TextData/Format.php
+++ b/src/PhpSpreadsheet/Calculation/TextData/Format.php
@@ -42,7 +42,7 @@ class Format
             if ($value < 0) {
                 $round = 0 - $round;
             }
-            $value = MathTrig\Mround::evaluate($value, $round);
+            $value = MathTrig\Round::multiple($value, $round);
         }
         $mask = "$mask;($mask)";