diff --git a/CHANGELOG b/CHANGELOG
index 72d3b8b..14c5c6d 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,8 +1,8 @@
 *SVN*
 
-* Make Element#absolutize and Element#relativize properly use Element#getStyle.  Closes #8580.  [Christophe Porteneuve]
+* Add Number.prototype.round/ceil/floor/abs as an aliases to the respective methods in Math. Refactor to seperate number extensions from base.js.  [Thomas Fuchs]
 
-* Add Number.prototype.round as an alias to Math.round().  [Thomas Fuchs]
+* Make Element#absolutize and Element#relativize properly use Element#getStyle.  Closes #8580.  [Christophe Porteneuve]
 
 * Test library fixes: make rake dist work on Windows, only teardown if a browser is supported.  Closes #8463, #8498.  [Mislav Marohnić, grant]
 
diff --git a/src/base.js b/src/base.js
index ddef1c5..e38522f 100644
--- a/src/base.js
+++ b/src/base.js
@@ -113,34 +113,6 @@ Object.extend(Function.prototype, {
 
 Function.prototype.defer = Function.prototype.delay.curry(0.01);
 
-Object.extend(Number.prototype, {
-  round: function() {
-    return Math.round(this);
-  },
-  
-  toColorPart: function() {
-    return this.toPaddedString(2, 16);
-  },
-
-  succ: function() {
-    return this + 1;
-  },
-  
-  times: function(iterator) {
-    $R(0, this, true).each(iterator);
-    return this;
-  },
-  
-  toPaddedString: function(length, radix) {
-    var string = this.toString(radix || 10);
-    return '0'.times(length - string.length) + string;
-  },
-  
-  toJSON: function() {
-    return isFinite(this) ? this.toString() : 'null';
-  }
-});
-
 Date.prototype.toJSON = function() {
   return '"' + this.getFullYear() + '-' +
     (this.getMonth() + 1).toPaddedString(2) + '-' +
diff --git a/src/number.js b/src/number.js
new file mode 100644
index 0000000..74becf2
--- /dev/null
+++ b/src/number.js
@@ -0,0 +1,27 @@
+Object.extend(Number.prototype, {
+  toColorPart: function() {
+    return this.toPaddedString(2, 16);
+  },
+
+  succ: function() {
+    return this + 1;
+  },
+  
+  times: function(iterator) {
+    $R(0, this, true).each(iterator);
+    return this;
+  },
+  
+  toPaddedString: function(length, radix) {
+    var string = this.toString(radix || 10);
+    return '0'.times(length - string.length) + string;
+  },
+  
+  toJSON: function() {
+    return isFinite(this) ? this.toString() : 'null';
+  }
+});
+
+$w('abs round ceil floor').each(function(method){
+  Number.prototype[method] = function(){ return Math[method](this); }
+});
\ No newline at end of file
diff --git a/src/prototype.js b/src/prototype.js
index b11be88..ab95f77 100644
--- a/src/prototype.js
+++ b/src/prototype.js
@@ -27,7 +27,7 @@ var Prototype = {
 
 <%= include 'base.js', 'string.js' %>
 
-<%= include 'enumerable.js', 'array.js', 'hash.js', 'range.js' %>
+<%= include 'enumerable.js', 'array.js', 'number.js', 'hash.js', 'range.js' %>
 
 <%= include 'ajax.js', 'dom.js', 'selector.js', 'form.js', 'event.js', 'deprecated.js' %>
 
diff --git a/test/unit/base.html b/test/unit/base.html
index c464b27..413de9b 100644
--- a/test/unit/base.html
+++ b/test/unit/base.html
@@ -218,35 +218,6 @@
       }
     },
     
-    testNumberRound: function() {with(this) {
-      assertEqual(1, (0.9).round());
-      assertEqual(-2, (-1.9).round());
-      
-      assertEqual(Math.round(Math.PI), Math.PI.round());
-    }},
-    
-    testNumberToColorPart: function() {with(this) {
-      assertEqual('00', (0).toColorPart());
-      assertEqual('0a', (10).toColorPart());
-      assertEqual('ff', (255).toColorPart());
-    }},
-    
-    testNumberToPaddedString: function() {with(this) {
-      assertEqual('00', (0).toPaddedString(2, 16));
-      assertEqual('0a', (10).toPaddedString(2, 16));
-      assertEqual('ff', (255).toPaddedString(2, 16));
-      assertEqual('000', (0).toPaddedString(3));
-      assertEqual('010', (10).toPaddedString(3));
-      assertEqual('100', (100).toPaddedString(3));
-      assertEqual('1000', (1000).toPaddedString(3));
-    }},
-    
-    testNumberToJSON: function() {with(this) {
-      assertEqual('null', Number.NaN.toJSON());
-      assertEqual('0', (0).toJSON());
-      assertEqual('-293', (-293).toJSON());
-    }},
-    
     testDateToJSON: function() {with(this) {
       assertEqual('\"1969-12-31T19:00:00\"', new Date(1969, 11, 31, 19).toJSON());
     }},
diff --git a/test/unit/number.html b/test/unit/number.html
new file mode 100644
index 0000000..b2cce08
--- /dev/null
+++ b/test/unit/number.html
@@ -0,0 +1,69 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head>
+  <title>Prototype Unit test file</title>
+  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
+  <script src="../../dist/prototype.js" type="text/javascript"></script>
+  <script src="../lib/unittest.js" type="text/javascript"></script>
+  <link rel="stylesheet" href="../test.css" type="text/css" />
+  <style type="text/css" media="screen">
+  /* <![CDATA[ */
+    #testcss1 { font-size:11px; color: #f00; }
+    #testcss2 { font-size:12px; color: #0f0; display: none; }
+  /* ]]> */
+  </style>
+</head>
+<body>
+<h1>Prototype Unit test file</h1>
+<p>
+  Test of utility functions in number.js
+</p>
+
+<!-- Log output -->
+<div id="testlog"> </div>
+
+<!-- Tests follow -->
+<script type="text/javascript" language="javascript" charset="utf-8">
+// <![CDATA[
+
+  new Test.Unit.Runner({
+    
+    testNumberMathMethods: function() {with(this) {
+      assertEqual(1, (0.9).round());
+      assertEqual(-2, (-1.9).floor());
+      assertEqual(-1, (-1.9).ceil());
+
+      $w('abs floor round ceil').each( function(method){
+        assertEqual(Math[method](Math.PI), Math.PI[method]());
+      });
+    }},
+
+    testNumberToColorPart: function() {with(this) {
+      assertEqual('00', (0).toColorPart());
+      assertEqual('0a', (10).toColorPart());
+      assertEqual('ff', (255).toColorPart());
+    }},
+
+    testNumberToPaddedString: function() {with(this) {
+      assertEqual('00', (0).toPaddedString(2, 16));
+      assertEqual('0a', (10).toPaddedString(2, 16));
+      assertEqual('ff', (255).toPaddedString(2, 16));
+      assertEqual('000', (0).toPaddedString(3));
+      assertEqual('010', (10).toPaddedString(3));
+      assertEqual('100', (100).toPaddedString(3));
+      assertEqual('1000', (1000).toPaddedString(3));
+    }},
+
+    testNumberToJSON: function() {with(this) {
+      assertEqual('null', Number.NaN.toJSON());
+      assertEqual('0', (0).toJSON());
+      assertEqual('-293', (-293).toJSON());
+    }}
+
+  }, 'testlog');
+
+// ]]>
+</script>
+</body>
+</html>