diff --git a/OpenNest.Core/Helper.cs b/OpenNest.Core/Helper.cs
index 44aa015..60c3ed6 100644
--- a/OpenNest.Core/Helper.cs
+++ b/OpenNest.Core/Helper.cs
@@ -11,39 +11,6 @@ namespace OpenNest
 {
     public static class Helper
     {
-        /// <summary>
-        /// Rounds a number down to the nearest factor.
-        /// </summary>
-        /// <param name="num"></param>
-        /// <param name="factor"></param>
-        /// <returns></returns>
-        public static double RoundDownToNearest(double num, double factor)
-        {
-            return factor.IsEqualTo(0) ? num : System.Math.Floor(num / factor) * factor;
-        }
-
-        /// <summary>
-        /// Rounds a number up to the nearest factor.
-        /// </summary>
-        /// <param name="num"></param>
-        /// <param name="factor"></param>
-        /// <returns></returns>
-        public static double RoundUpToNearest(double num, double factor)
-        {
-            return factor.IsEqualTo(0) ? num : System.Math.Ceiling(num / factor) * factor;
-        }
-
-        /// <summary>
-        /// Rounds a number to the nearest factor using midpoint rounding convention.
-        /// </summary>
-        /// <param name="num"></param>
-        /// <param name="factor"></param>
-        /// <returns></returns>
-        public static double RoundToNearest(double num, double factor)
-        {
-            return factor.IsEqualTo(0) ? num : System.Math.Round(num / factor) * factor;
-        }
-
         public static void Optimize(IList<Arc> arcs)
         {
             for (int i = 0; i < arcs.Count; ++i)
diff --git a/OpenNest.Core/Math/Rounding.cs b/OpenNest.Core/Math/Rounding.cs
new file mode 100644
index 0000000..28892b2
--- /dev/null
+++ b/OpenNest.Core/Math/Rounding.cs
@@ -0,0 +1,40 @@
+using OpenNest.Math;
+
+namespace OpenNest.Math
+{
+    public static class Rounding
+    {
+        /// <summary>
+        /// Rounds a number down to the nearest factor.
+        /// </summary>
+        /// <param name="num"></param>
+        /// <param name="factor"></param>
+        /// <returns></returns>
+        public static double RoundDownToNearest(double num, double factor)
+        {
+            return factor.IsEqualTo(0) ? num : System.Math.Floor(num / factor) * factor;
+        }
+
+        /// <summary>
+        /// Rounds a number up to the nearest factor.
+        /// </summary>
+        /// <param name="num"></param>
+        /// <param name="factor"></param>
+        /// <returns></returns>
+        public static double RoundUpToNearest(double num, double factor)
+        {
+            return factor.IsEqualTo(0) ? num : System.Math.Ceiling(num / factor) * factor;
+        }
+
+        /// <summary>
+        /// Rounds a number to the nearest factor using midpoint rounding convention.
+        /// </summary>
+        /// <param name="num"></param>
+        /// <param name="factor"></param>
+        /// <returns></returns>
+        public static double RoundToNearest(double num, double factor)
+        {
+            return factor.IsEqualTo(0) ? num : System.Math.Round(num / factor) * factor;
+        }
+    }
+}
diff --git a/OpenNest.Core/Plate.cs b/OpenNest.Core/Plate.cs
index 4bc49b7..5005529 100644
--- a/OpenNest.Core/Plate.cs
+++ b/OpenNest.Core/Plate.cs
@@ -412,8 +412,8 @@ namespace OpenNest
             }
 
             Size = new Size(
-                Helper.RoundUpToNearest(width, roundingFactor),
-                Helper.RoundUpToNearest(length, roundingFactor));
+                Rounding.RoundUpToNearest(width, roundingFactor),
+                Rounding.RoundUpToNearest(length, roundingFactor));
         }
 
         /// <summary>