diff -urN IronRuby-Pre-Alpha1.orig/Src/Ruby/Builtins/Bignum.cs IronRuby-Pre-Alpha1/Src/Ruby/Builtins/Bignum.cs
--- IronRuby-Pre-Alpha1.orig/Src/Ruby/Builtins/Bignum.cs	2007-07-16 11:43:58.000000000 +0900
+++ IronRuby-Pre-Alpha1/Src/Ruby/Builtins/Bignum.cs	2007-07-26 23:24:38.000000000 +0900
@@ -25,5 +25,15 @@
     public sealed class BignumOps : Integer {
         private BignumOps() {
         }
+
+        [RubyMethodAttribute("*", RubyMethodAttributes.PublicInstance)]
+        public static object Multiply(BigInteger self, BigInteger value) {
+            return self * value;
+        }
+
+        [RubyMethodAttribute("inspect", RubyMethodAttributes.PublicInstance)]
+        public static object ToString(BigInteger self) {
+            return new MutableString(self.ToString());
+        }
     }
 }
diff -urN IronRuby-Pre-Alpha1.orig/Src/Ruby/Builtins/FixnumOps.cs IronRuby-Pre-Alpha1/Src/Ruby/Builtins/FixnumOps.cs
--- IronRuby-Pre-Alpha1.orig/Src/Ruby/Builtins/FixnumOps.cs	2007-07-19 08:51:28.000000000 +0900
+++ IronRuby-Pre-Alpha1/Src/Ruby/Builtins/FixnumOps.cs	2007-07-26 23:23:32.000000000 +0900
@@ -46,7 +46,20 @@
 
         [RubyMethodAttribute("*", RubyMethodAttributes.PublicInstance)]
         public static object Multiply(int self, int value) {
-            return self * value;
+            long result = (long)self * value;
+            if (Int32.MinValue <= result && result <= Int32.MaxValue) {
+                return (int)result;
+            }
+            return BignumOps.Multiply((BigInteger)self, (BigInteger)value);
+        }
+
+        [RubyMethodAttribute("**", RubyMethodAttributes.PublicInstance)]
+        public static object Power(int self, int value) {
+            BigInteger result = ((BigInteger)self).Power(value);
+            if (Int32.MinValue <= result && result <= Int32.MaxValue) {
+                return (int)result;
+            }
+            return result;
         }
 
         [RubyMethodAttribute("/", RubyMethodAttributes.PublicInstance)]
@@ -54,6 +67,11 @@
             return self / value;
         }
 
+        [RubyMethodAttribute("/", RubyMethodAttributes.PublicInstance)]
+        public static object Divide(int self, double value) {
+            return self / value;
+        }
+
         [RubyMethodAttribute(">", RubyMethodAttributes.PublicInstance)]
         public static bool GraterThan(int self, int value) {
             return self > value;
diff -urN IronRuby-Pre-Alpha1.orig/Src/Ruby/Builtins/FloatOps.cs IronRuby-Pre-Alpha1/Src/Ruby/Builtins/FloatOps.cs
--- IronRuby-Pre-Alpha1.orig/Src/Ruby/Builtins/FloatOps.cs	2007-07-17 19:31:10.000000000 +0900
+++ IronRuby-Pre-Alpha1/Src/Ruby/Builtins/FloatOps.cs	2007-07-26 23:03:55.000000000 +0900
@@ -21,6 +21,11 @@
     [RubyExtensionClass("Float", typeof(double), Inherits = typeof(Numeric))]
     public static class FloatOps {
 
+        [RubyMethodAttribute("/", RubyMethodAttributes.PublicInstance)]
+        public static object Divide(double self, double value) {
+            return self / value;
+        }
+
         [RubyMethodAttribute("to_i", RubyMethodAttributes.PublicInstance)]
         public static int ToInteger(double self) {
             return System.Convert.ToInt32(System.Math.Floor(self));