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@@ -540,6 +540,18 @@
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     OBJECT sub(STATE, FIXNUM other) {
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       return Object::i2n(state, n2i() - other->n2i());
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     }
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+
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+    OBJECT multiply(STATE, FIXNUM other) {
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+      return Object::i2n(state, n2i() * other->n2i());
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+    }
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+
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+    OBJECT divide(STATE, FIXNUM other) {
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+      return Object::i2n(state, n2i() / other->n2i());
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+    }
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+
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+    OBJECT modulo(STATE, FIXNUM other) {
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+      return Object::i2n(state, n2i() % other->n2i());
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+    }
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   };
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   typedef Fixnum* FIXNUM;

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@@ -34,5 +34,26 @@
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     FIXNUM zero = as<Fixnum>(one->sub(state, one));
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     TS_ASSERT_EQUALS(zero->n2i(), 0);
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   }
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+
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+  void test_multiply() {
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+    FIXNUM one = as<Fixnum>(Object::i2n(4));
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+
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+    FIXNUM two = as<Fixnum>(one->multiply(state, one));
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+    TS_ASSERT_EQUALS(two->n2i(), 16);
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+  }
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+
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+  void test_divide() {
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+    FIXNUM one = as<Fixnum>(Object::i2n(4));
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+
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+    FIXNUM two = as<Fixnum>(one->divide(state, one));
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+    TS_ASSERT_EQUALS(two->n2i(), 1);
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+  }
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+
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+  void test_modulo() {
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+    FIXNUM one = as<Fixnum>(Object::i2n(4));
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+
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+    FIXNUM two = as<Fixnum>(one->modulo(state, one));
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+    TS_ASSERT_EQUALS(two->n2i(), 0);
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+  }
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 };