diff --git a/ClosedXML/Excel/Cells/XLCell.cs b/ClosedXML/Excel/Cells/XLCell.cs
index 5909367..0dd21de 100644
--- a/ClosedXML/Excel/Cells/XLCell.cs
+++ b/ClosedXML/Excel/Cells/XLCell.cs
@@ -1615,8 +1615,8 @@
                 val = string.Empty;
             else if (value is DateTime)
                 val = ((DateTime)value).ToString("o");
-            else if (value is double)
-                val = ((double)value).ToInvariantString();
+            else if (value.IsNumber())
+                val = Convert.ToDecimal(value).ToInvariantString();
             else
                 val = value.ToString();
             _richText = null;
diff --git a/ClosedXML/Extensions.cs b/ClosedXML/Extensions.cs
index 334b57b..aaca2a7 100644
--- a/ClosedXML/Extensions.cs
+++ b/ClosedXML/Extensions.cs
@@ -203,6 +203,20 @@
 
     }
 
+    public static class DecimalExtensions
+    {
+        //All numbers are stored in XL files as invarient culture this is just a easy helper
+        public static String ToInvariantString(this Decimal value)
+        {
+            return value.ToString(CultureInfo.InvariantCulture);
+        }
+
+        public static Decimal SaveRound(this Decimal value)
+        {
+            return Math.Round(value, 6);
+        }
+    }
+
     public static class DoubleExtensions
     {
         //All numbers are stored in XL files as invarient culture this is just a easy helper
@@ -310,5 +324,23 @@
             return value.HasValue ? new DoubleValue(Math.Round(value, 6)) : value;
         }
     }
+
+    public static class ObjectExtensions
+    {
+        public static bool IsNumber(this object value)
+        {
+            return value is sbyte
+                    || value is byte
+                    || value is short
+                    || value is ushort
+                    || value is int
+                    || value is uint
+                    || value is long
+                    || value is ulong
+                    || value is float
+                    || value is double
+                    || value is decimal;
+        }
+    }
 }
 
diff --git a/ClosedXML_Examples/Misc/DataTypes.cs b/ClosedXML_Examples/Misc/DataTypes.cs
index e4feeb1..14abad9 100644
--- a/ClosedXML_Examples/Misc/DataTypes.cs
+++ b/ClosedXML_Examples/Misc/DataTypes.cs
@@ -68,6 +68,17 @@
 
             ro++;
 
+            ws.Cell(++ro, co).Value = "Decimal Number:";
+            ws.Cell(ro, co + 1).Value = 123.45m;
+
+            ws.Cell(++ro, co).Value = "Float Number:";
+            ws.Cell(ro, co + 1).Value = 123.45f;
+
+            ws.Cell(++ro, co).Value = "Double Number:";
+            ws.Cell(ro, co + 1).Value = 123.45d;
+
+            ro++;
+
             ws.Cell(++ro, co).Value = "Explicit Text:";
             ws.Cell(ro, co + 1).Value = "'Hello World.";
 
@@ -192,7 +203,7 @@
                 .SetDataType(XLCellValues.DateTime)
                 .SetDataType(XLCellValues.Boolean)
                 .SetDataType(XLCellValues.Text);
-                    
+
             ws.Columns(2, 3).AdjustToContents();
 
             workbook.SaveAs(filePath);
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
index 5b29266..9b03a64 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Misc/DataTypes.xlsx
Binary files differ
diff --git a/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx b/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
index ca68eee..0221170 100644
--- a/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
+++ b/ClosedXML_Tests/Resource/Examples/Misc/DataTypesUnderDifferentCulture.xlsx
Binary files differ