diff --git a/EvenPerfectBitScanner.Benchmarks/Mod10Benchmarks.cs b/EvenPerfectBitScanner.Benchmarks/Mod10Benchmarks.cs
new file mode 100644
index 0000000..90a18d6
--- /dev/null
+++ b/EvenPerfectBitScanner.Benchmarks/Mod10Benchmarks.cs
@@ -0,0 +1,32 @@
+using System.Numerics;
+using BenchmarkDotNet.Attributes;
+using PerfectNumbers.Core;
+
+namespace EvenPerfectBitScanner.Benchmarks;
+
+[MemoryDiagnoser]
+public class Mod10Benchmarks
+{
+    [Params(3UL, 8191UL, 131071UL, 2147483647UL)]
+    public ulong Value { get; set; }
+
+    [Benchmark(Baseline = true)]
+    public ulong LegacyModulo()
+    {
+		ulong value = Value;
+		UInt128 zero = UInt128.Zero;
+		if (value == zero)
+		{
+			return 0UL;
+		}
+
+		return value % 10UL;
+    }
+
+    [Benchmark]
+    public ulong ModMethodModulo()
+    {
+        return Value.Mod10();
+    }
+}
+
diff --git a/PerfectNumbers.Core/ULongExtensions.cs b/PerfectNumbers.Core/ULongExtensions.cs
index 5073c0e..25b4ae6 100644
--- a/PerfectNumbers.Core/ULongExtensions.cs
+++ b/PerfectNumbers.Core/ULongExtensions.cs
@@ -124,7 +124,7 @@ public static class ULongExtensions
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-	public static ulong Mod10(ulong value)
+	public static ulong Mod10(this ulong value)
 	{
 		ulong quotient = (ulong)(((UInt128)value * 0xCCCCCCCCCCCCCCCDUL) >> 67);
 		return value - quotient * 10UL;