diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1a08b56e15..64884728e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Added
 
 - Support for configuring a Chart Title's overlay [PR #3325](https://github.com/PHPOffice/PhpSpreadsheet/pull/3325)
+- Support for fixed value divisor in fractional Number Format Masks [PR #3339](https://github.com/PHPOffice/PhpSpreadsheet/pull/3339)
 
 ### Changed
 
diff --git a/src/PhpSpreadsheet/Style/NumberFormat/FractionFormatter.php b/src/PhpSpreadsheet/Style/NumberFormat/FractionFormatter.php
index d1fc89fd00..fdcf98329b 100644
--- a/src/PhpSpreadsheet/Style/NumberFormat/FractionFormatter.php
+++ b/src/PhpSpreadsheet/Style/NumberFormat/FractionFormatter.php
@@ -26,23 +26,28 @@ public static function format($value, string $format): string
         $decimalLength = strlen($decimalPart);
         $decimalDivisor = 10 ** $decimalLength;
 
-        /** @var float */
-        $GCD = MathTrig\Gcd::evaluate($decimalPart, $decimalDivisor);
-        /** @var float */
-        $decimalPartx = $decimalPart;
+        preg_match('/(#?.*\?)\/(\?+|\d+)/', $format, $matches);
+        $formatIntegerPart = $matches[1];
 
-        $adjustedDecimalPart = $decimalPartx / $GCD;
-        $adjustedDecimalDivisor = $decimalDivisor / $GCD;
+        if (is_numeric($matches[2])) {
+            $fractionDivisor = 100 / (int) $matches[2];
+        } else {
+            /** @var float */
+            $fractionDivisor = MathTrig\Gcd::evaluate((int) $decimalPart, $decimalDivisor);
+        }
+
+        $adjustedDecimalPart = (int) round((int) $decimalPart / $fractionDivisor, 0);
+        $adjustedDecimalDivisor = $decimalDivisor / $fractionDivisor;
 
-        if ((strpos($format, '0') !== false)) {
+        if ((strpos($formatIntegerPart, '0') !== false)) {
             return "{$sign}{$integerPart} {$adjustedDecimalPart}/{$adjustedDecimalDivisor}";
-        } elseif ((strpos($format, '#') !== false)) {
+        } elseif ((strpos($formatIntegerPart, '#') !== false)) {
             if ($integerPart == 0) {
                 return "{$sign}{$adjustedDecimalPart}/{$adjustedDecimalDivisor}";
             }
 
             return "{$sign}{$integerPart} {$adjustedDecimalPart}/{$adjustedDecimalDivisor}";
-        } elseif ((substr($format, 0, 3) == '? ?')) {
+        } elseif ((substr($formatIntegerPart, 0, 3) == '? ?')) {
             if ($integerPart == 0) {
                 $integerPart = '';
             }
diff --git a/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php b/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php
index 989f33abc8..f089ebacfe 100644
--- a/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php
+++ b/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php
@@ -226,7 +226,7 @@ public static function format($value, string $format): string
             $format = self::pregReplace('/0,+/', '0', $format);
             $format = self::pregReplace('/#,+/', '#', $format);
         }
-        if (preg_match('/#?.*\?\/\?/', $format, $m)) {
+        if (preg_match('/#?.*\?\/(\?+|\d+)/', $format)) {
             $value = FractionFormatter::format($value, $format);
         } else {
             // Handle the number itself
diff --git a/tests/PhpSpreadsheetTests/Style/NumberFormatTest.php b/tests/PhpSpreadsheetTests/Style/NumberFormatTest.php
index ff5db4cb45..d9f85d0b16 100644
--- a/tests/PhpSpreadsheetTests/Style/NumberFormatTest.php
+++ b/tests/PhpSpreadsheetTests/Style/NumberFormatTest.php
@@ -56,6 +56,23 @@ public function providerNumberFormat(): array
         return require 'tests/data/Style/NumberFormat.php';
     }
 
+    /**
+     * @dataProvider providerNumberFormatFractions
+     *
+     * @param mixed $expectedResult
+     * @param mixed $args
+     */
+    public function testFormatValueWithMaskFraction($expectedResult, ...$args): void
+    {
+        $result = NumberFormat::toFormattedString(...$args);
+        self::assertEquals($expectedResult, $result);
+    }
+
+    public function providerNumberFormatFractions(): array
+    {
+        return require 'tests/data/Style/NumberFormatFractions.php';
+    }
+
     /**
      * @dataProvider providerNumberFormatDates
      *
diff --git a/tests/data/Style/NumberFormat.php b/tests/data/Style/NumberFormat.php
index 755a0c57bb..4bd6b48118 100644
--- a/tests/data/Style/NumberFormat.php
+++ b/tests/data/Style/NumberFormat.php
@@ -267,68 +267,6 @@
         -0.123,
         '_(0.00%_;( 0.00% )',
     ],
-    // Fraction
-    [
-        '5 1/4',
-        5.25,
-        '# ???/???',
-    ],
-    // Vulgar Fraction
-    [
-        '5 3/10',
-        5.2999999999999998,
-        '# ???/???',
-    ],
-    [
-        '21/4',
-        5.25,
-        '???/???',
-    ],
-    [
-        '0 3/4',
-        0.75,
-        '0??/???',
-    ],
-    [
-        '3/4',
-        0.75,
-        '#??/???',
-    ],
-    [
-        ' 3/4',
-        0.75,
-        '? ??/???',
-    ],
-    [
-        ' 3/4',
-        '0.75000',
-        '? ??/???',
-    ],
-    [
-        '5 1/16',
-        5.0625,
-        '? ??/???',
-    ],
-    [
-        '- 5/8',
-        -0.625,
-        '? ??/???',
-    ],
-    [
-        '0',
-        0,
-        '? ??/???',
-    ],
-    [
-        '0',
-        '0.000',
-        '? ??/???',
-    ],
-    [
-        '-16',
-        '-016.0',
-        '? ??/???',
-    ],
     // Complex formats
     [
         '(001) 2-3456-789',
diff --git a/tests/data/Style/NumberFormatFractions.php b/tests/data/Style/NumberFormatFractions.php
new file mode 100644
index 0000000000..0b592027b6
--- /dev/null
+++ b/tests/data/Style/NumberFormatFractions.php
@@ -0,0 +1,104 @@
+<?php
+
+//  value, format, result
+
+return [
+    // Fraction
+    [
+        '5 1/4',
+        5.25,
+        '# ???/???',
+    ],
+    [
+        '5 3/10',
+        5.2999999999999998,
+        '# ???/???',
+    ],
+    // Vulgar Fraction
+    [
+        '21/4',
+        5.25,
+        '???/???',
+    ],
+    [
+        '0 3/4',
+        0.75,
+        '0??/???',
+    ],
+    [
+        '3/4',
+        0.75,
+        '#??/???',
+    ],
+    [
+        ' 3/4',
+        0.75,
+        '? ??/???',
+    ],
+    [
+        ' 3/4',
+        '0.75000',
+        '? ??/???',
+    ],
+    [
+        '5 1/16',
+        5.0625,
+        '? ??/???',
+    ],
+    [
+        '- 5/8',
+        -0.625,
+        '? ??/???',
+    ],
+    [
+        '0',
+        0,
+        '? ??/???',
+    ],
+    [
+        '0',
+        '0.000',
+        '? ??/???',
+    ],
+    [
+        '-16',
+        '-016.0',
+        '? ??/???',
+    ],
+    // Fixed base Fraction
+    [
+        '5 1/2',
+        5.25,
+        '# ???/2',
+    ],
+    [
+        '5 1/4',
+        5.25,
+        '# ???/4',
+    ],
+    [
+        '5 2/8',
+        5.25,
+        '# ???/8',
+    ],
+    [
+        '5 3/10',
+        5.25,
+        '# ???/10',
+    ],
+    [
+        '5 25/100',
+        5.25,
+        '# ???/100',
+    ],
+    [
+        '525/100',
+        5.25,
+        '??/100',
+    ],
+    [
+        '525/100',
+        5.25,
+        '???/100',
+    ],
+];