diff --git a/Lib/test/test_abstract_numbers.py b/Lib/test/test_abstract_numbers.py
index 19bfc79..0c1f28d 100644
--- a/Lib/test/test_abstract_numbers.py
+++ b/Lib/test/test_abstract_numbers.py
@@ -1,11 +1,12 @@
 """Unit tests for numbers.py."""
 
-import unittest
-from test import test_support
-from numbers import Number
-from numbers import Exact, Inexact
-from numbers import Complex, Real, Rational, Integral
+import math
 import operator
+import unittest
+from numbers import Complex, Real, Rational, Integral
+from numbers import Exact, Inexact
+from numbers import Number
+from test import test_support
 
 class TestNumbers(unittest.TestCase):
     def test_int(self):
@@ -49,8 +50,8 @@
         self.failUnless(issubclass(complex, Inexact))
 
         c1, c2 = complex(3, 2), complex(4,1)
-        # XXX: This is not ideal, but see the comment in builtin_trunc().
-        self.assertRaises(AttributeError, trunc, c1)
+        # XXX: This is not ideal, but see the comment in math_trunc().
+        self.assertRaises(AttributeError, math.trunc, c1)
         self.assertRaises(TypeError, float, c1)
         self.assertRaises(TypeError, int, c1)
 
diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index a1e2a12..59a9dcd 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1766,38 +1766,6 @@
                 raise ValueError
         self.assertRaises(ValueError, sum, BadSeq())
 
-    def test_trunc(self):
-
-        self.assertEqual(trunc(1), 1)
-        self.assertEqual(trunc(-1), -1)
-        self.assertEqual(type(trunc(1)), int)
-        self.assertEqual(type(trunc(1.5)), int)
-        self.assertEqual(trunc(1.5), 1)
-        self.assertEqual(trunc(-1.5), -1)
-        self.assertEqual(trunc(1.999999), 1)
-        self.assertEqual(trunc(-1.999999), -1)
-        self.assertEqual(trunc(-0.999999), -0)
-        self.assertEqual(trunc(-100.999), -100)
-
-        class TestTrunc(object):
-            def __trunc__(self):
-                return 23
-
-        class TestNoTrunc(object):
-            pass
-
-        self.assertEqual(trunc(TestTrunc()), 23)
-
-        self.assertRaises(TypeError, trunc)
-        self.assertRaises(TypeError, trunc, 1, 2)
-        # XXX: This is not ideal, but see the comment in builtin_trunc().
-        self.assertRaises(AttributeError, trunc, TestNoTrunc())
-
-        t = TestNoTrunc()
-        t.__trunc__ = lambda *args: args
-        self.assertEquals((), trunc(t))
-        self.assertRaises(TypeError, trunc, t, 0)
-
     def test_tuple(self):
         self.assertEqual(tuple(()), ())
         t0_3 = (0, 1, 2, 3)
diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py
index 0ea4a36..0c8852c 100644
--- a/Lib/test/test_decimal.py
+++ b/Lib/test/test_decimal.py
@@ -25,10 +25,11 @@
 """
 from __future__ import with_statement
 
-import unittest
 import glob
+import math
 import os, sys
 import pickle, copy
+import unittest
 from decimal import *
 from test.test_support import (TestSkipped, run_unittest, run_doctest,
                                is_resource_enabled)
@@ -1225,7 +1226,7 @@
             # should work the same as to_integral in the ROUND_DOWN mode
             d = Decimal(s)
             r = d.to_integral(ROUND_DOWN)
-            self.assertEqual(Decimal(trunc(d)), r)
+            self.assertEqual(Decimal(math.trunc(d)), r)
 
 class ContextAPItests(unittest.TestCase):
 
diff --git a/Lib/test/test_math.py b/Lib/test/test_math.py
index 16f0f4d..e0e72f5 100644
--- a/Lib/test/test_math.py
+++ b/Lib/test/test_math.py
@@ -237,6 +237,37 @@
         self.ftest('tanh(0)', math.tanh(0), 0)
         self.ftest('tanh(1)+tanh(-1)', math.tanh(1)+math.tanh(-1), 0)
 
+    def test_trunc(self):
+        self.assertEqual(math.trunc(1), 1)
+        self.assertEqual(math.trunc(-1), -1)
+        self.assertEqual(type(math.trunc(1)), int)
+        self.assertEqual(type(math.trunc(1.5)), int)
+        self.assertEqual(math.trunc(1.5), 1)
+        self.assertEqual(math.trunc(-1.5), -1)
+        self.assertEqual(math.trunc(1.999999), 1)
+        self.assertEqual(math.trunc(-1.999999), -1)
+        self.assertEqual(math.trunc(-0.999999), -0)
+        self.assertEqual(math.trunc(-100.999), -100)
+
+        class TestTrunc(object):
+            def __trunc__(self):
+                return 23
+
+        class TestNoTrunc(object):
+            pass
+
+        self.assertEqual(math.trunc(TestTrunc()), 23)
+
+        self.assertRaises(TypeError, math.trunc)
+        self.assertRaises(TypeError, math.trunc, 1, 2)
+        # XXX: This is not ideal, but see the comment in math_trunc().
+        self.assertRaises(AttributeError, math.trunc, TestNoTrunc())
+
+        t = TestNoTrunc()
+        t.__trunc__ = lambda *args: args
+        self.assertEquals((), math.trunc(t))
+        self.assertRaises(TypeError, math.trunc, t, 0)
+
     def testCopysign(self):
         self.assertEqual(math.copysign(1, 42), 1.0)
         self.assertEqual(math.copysign(0., 42), 0.0)
diff --git a/Lib/test/test_rational.py b/Lib/test/test_rational.py
index b97922c..3c3d1f9 100644
--- a/Lib/test/test_rational.py
+++ b/Lib/test/test_rational.py
@@ -195,7 +195,7 @@
         self.assertEqual(R.from_float(0.0).approximate(10000), R(0))
 
     def testConversions(self):
-        self.assertTypedEquals(-1, trunc(R(-11, 10)))
+        self.assertTypedEquals(-1, math.trunc(R(-11, 10)))
         self.assertTypedEquals(-1, int(R(-11, 10)))
 
         self.assertEquals(False, bool(R(0, 1)))
@@ -322,11 +322,11 @@
         # Because 10**23 can't be represented exactly as a float:
         self.assertFalse(R(10**23) == float(10**23))
         # The first test demonstrates why these are important.
-        self.assertFalse(1e23 < float(R(trunc(1e23) + 1)))
-        self.assertTrue(1e23 < R(trunc(1e23) + 1))
-        self.assertFalse(1e23 <= R(trunc(1e23) - 1))
-        self.assertTrue(1e23 > R(trunc(1e23) - 1))
-        self.assertFalse(1e23 >= R(trunc(1e23) + 1))
+        self.assertFalse(1e23 < float(R(math.trunc(1e23) + 1)))
+        self.assertTrue(1e23 < R(math.trunc(1e23) + 1))
+        self.assertFalse(1e23 <= R(math.trunc(1e23) - 1))
+        self.assertTrue(1e23 > R(math.trunc(1e23) - 1))
+        self.assertFalse(1e23 >= R(math.trunc(1e23) + 1))
 
     def testBigComplexComparisons(self):
         self.assertFalse(R(10**23) == complex(10**23))