diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index dabe6308..4249ea3f 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -2329,7 +2329,7 @@ class Calculation
         ],
         'SUMPRODUCT' => [
             'category' => Category::CATEGORY_MATH_AND_TRIG,
-            'functionCall' => [MathTrig\SumProduct::class, 'evaluate'],
+            'functionCall' => [MathTrig\Sum::class, 'product'],
             'argumentCount' => '1+',
         ],
         'SUMSQ' => [
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig.php b/src/PhpSpreadsheet/Calculation/MathTrig.php
index 14614004..ea4c265d 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig.php
@@ -840,8 +840,8 @@ class MathTrig
      *
      * @Deprecated 1.18.0
      *
-     * @See MathTrig\SumProduct::evaluate()
-     *      Use the evaluate method in the MathTrig\SumProduct class instead
+     * @See MathTrig\Sum::product()
+     *      Use the product method in the MathTrig\Sum class instead
      *
      * @param mixed ...$args Data values
      *
@@ -849,7 +849,7 @@ class MathTrig
      */
     public static function SUMPRODUCT(...$args)
     {
-        return MathTrig\SumProduct::evaluate(...$args);
+        return MathTrig\Sum::product(...$args);
     }
 
     /**
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Arabic.php b/src/PhpSpreadsheet/Calculation/MathTrig/Arabic.php
index b3d8c330..b852eeac 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Arabic.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Arabic.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class Arabic
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Base.php b/src/PhpSpreadsheet/Calculation/MathTrig/Base.php
index 373bcf08..becba9a2 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Base.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Base.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class Base
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Degrees.php b/src/PhpSpreadsheet/Calculation/MathTrig/Degrees.php
index 501817be..317c47c8 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Degrees.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Degrees.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class Degrees
 {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Exp.php b/src/PhpSpreadsheet/Calculation/MathTrig/Exp.php
index f3f8af59..ce930a83 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Exp.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Exp.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class Exp
 {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/IntClass.php b/src/PhpSpreadsheet/Calculation/MathTrig/IntClass.php
index c8f35e48..7aa3d06a 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/IntClass.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/IntClass.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class IntClass
 {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Mod.php b/src/PhpSpreadsheet/Calculation/MathTrig/Mod.php
index 04267ee9..813434ad 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Mod.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Mod.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class Mod
 {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Power.php b/src/PhpSpreadsheet/Calculation/MathTrig/Power.php
index 70d177cd..798ad535 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Power.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Power.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class Power
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Quotient.php b/src/PhpSpreadsheet/Calculation/MathTrig/Quotient.php
index 774b5fa1..9beb493a 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Quotient.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Quotient.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class Quotient
 {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Radians.php b/src/PhpSpreadsheet/Calculation/MathTrig/Radians.php
index 15e97011..ca549c03 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Radians.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Radians.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class Radians
 {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Roman.php b/src/PhpSpreadsheet/Calculation/MathTrig/Roman.php
index 865a5101..71a6df3a 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Roman.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Roman.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class Roman
@@ -769,6 +769,7 @@ class Roman
         3998 => ['MMMLMVLIII', 'MMMXMVIII', 'MMMVMIII'],
         3999 => ['MMMLMVLIV', 'MMMXMIX', 'MMMVMIV', 'MMMIM'],
     ];
+
     private const THOUSANDS = ['', 'M', 'MM', 'MMM'];
     private const HUNDREDS = ['', 'C', 'CC', 'CCC', 'CD', 'D', 'DC', 'DCC', 'DCCC', 'CM'];
     private const TENS = ['', 'X', 'XX', 'XXX', 'XL', 'L', 'LX', 'LXX', 'LXXX', 'XC'];
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/SeriesSum.php b/src/PhpSpreadsheet/Calculation/MathTrig/SeriesSum.php
index 73238214..2ada9df4 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/SeriesSum.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/SeriesSum.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class SeriesSum
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Sign.php b/src/PhpSpreadsheet/Calculation/MathTrig/Sign.php
index 1b955a80..a48cf0f9 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Sign.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Sign.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class Sign
 {
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Subtotal.php b/src/PhpSpreadsheet/Calculation/MathTrig/Subtotal.php
index c60842f7..946142a7 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Subtotal.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Subtotal.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 use PhpOffice\PhpSpreadsheet\Calculation\Statistical;
 
@@ -52,7 +52,7 @@ class Subtotal
 
     /** @var callable[] */
     private const CALL_FUNCTIONS = [
-        1 => [Statistical\Averages::class, 'AVERAGE'],
+        1 => [Statistical\Averages::class, 'average'],
         [Statistical\Counts::class, 'COUNT'], // 2
         [Statistical\Counts::class, 'COUNTA'], // 3
         [Statistical\Maximum::class, 'MAX'], // 4
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Sum.php b/src/PhpSpreadsheet/Calculation/MathTrig/Sum.php
index cffa68c5..741734d9 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Sum.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Sum.php
@@ -71,4 +71,45 @@ class Sum
 
         return $returnValue;
     }
+
+    /**
+     * SUMPRODUCT.
+     *
+     * Excel Function:
+     *        SUMPRODUCT(value1[,value2[, ...]])
+     *
+     * @param mixed ...$args Data values
+     *
+     * @return float|string The result, or a string containing an error
+     */
+    public static function product(...$args)
+    {
+        $arrayList = $args;
+
+        $wrkArray = Functions::flattenArray(array_shift($arrayList));
+        $wrkCellCount = count($wrkArray);
+
+        for ($i = 0; $i < $wrkCellCount; ++$i) {
+            if ((!is_numeric($wrkArray[$i])) || (is_string($wrkArray[$i]))) {
+                $wrkArray[$i] = 0;
+            }
+        }
+
+        foreach ($arrayList as $matrixData) {
+            $array2 = Functions::flattenArray($matrixData);
+            $count = count($array2);
+            if ($wrkCellCount != $count) {
+                return Functions::VALUE();
+            }
+
+            foreach ($array2 as $i => $val) {
+                if ((!is_numeric($val)) || (is_string($val))) {
+                    $val = 0;
+                }
+                $wrkArray[$i] *= $val;
+            }
+        }
+
+        return array_sum($wrkArray);
+    }
 }
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/SumProduct.php b/src/PhpSpreadsheet/Calculation/MathTrig/SumProduct.php
deleted file mode 100644
index 7700d008..00000000
--- a/src/PhpSpreadsheet/Calculation/MathTrig/SumProduct.php
+++ /dev/null
@@ -1,49 +0,0 @@
-<?php
-
-namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
-
-use PhpOffice\PhpSpreadsheet\Calculation\Functions;
-
-class SumProduct
-{
-    /**
-     * SUMPRODUCT.
-     *
-     * Excel Function:
-     *        SUMPRODUCT(value1[,value2[, ...]])
-     *
-     * @param mixed ...$args Data values
-     *
-     * @return float|string The result, or a string containing an error
-     */
-    public static function evaluate(...$args)
-    {
-        $arrayList = $args;
-
-        $wrkArray = Functions::flattenArray(array_shift($arrayList));
-        $wrkCellCount = count($wrkArray);
-
-        for ($i = 0; $i < $wrkCellCount; ++$i) {
-            if ((!is_numeric($wrkArray[$i])) || (is_string($wrkArray[$i]))) {
-                $wrkArray[$i] = 0;
-            }
-        }
-
-        foreach ($arrayList as $matrixData) {
-            $array2 = Functions::flattenArray($matrixData);
-            $count = count($array2);
-            if ($wrkCellCount != $count) {
-                return Functions::VALUE();
-            }
-
-            foreach ($array2 as $i => $val) {
-                if ((!is_numeric($val)) || (is_string($val))) {
-                    $val = 0;
-                }
-                $wrkArray[$i] *= $val;
-            }
-        }
-
-        return array_sum($wrkArray);
-    }
-}
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/SumSquares.php b/src/PhpSpreadsheet/Calculation/MathTrig/SumSquares.php
index a750b149..49fa6381 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/SumSquares.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/SumSquares.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 use PhpOffice\PhpSpreadsheet\Calculation\Functions;
 
 class SumSquares
diff --git a/src/PhpSpreadsheet/Calculation/MathTrig/Trunc.php b/src/PhpSpreadsheet/Calculation/MathTrig/Trunc.php
index 0a1c827e..4b3670f6 100644
--- a/src/PhpSpreadsheet/Calculation/MathTrig/Trunc.php
+++ b/src/PhpSpreadsheet/Calculation/MathTrig/Trunc.php
@@ -2,7 +2,7 @@
 
 namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;
 
-use Exception;
+use PhpOffice\PhpSpreadsheet\Calculation\Exception;
 
 class Trunc
 {