diff --git a/midas/resolver/builtin.py b/midas/resolver/builtin.py
new file mode 100644
index 0000000..0ceae90
--- /dev/null
+++ b/midas/resolver/builtin.py
@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from midas.checker.types import BaseType, Type
+
+if TYPE_CHECKING:
+    from midas.resolver.midas import MidasResolver
+
+
+def basic_op(ctx: MidasResolver, type: Type, op: str):
+    ctx.define_operation(
+        left=type,
+        operator=op,
+        right=type,
+        result=type,
+    )
+
+
+def define_builtins(ctx: MidasResolver):
+    """Define builtin types and operations"""
+    bool = ctx.define_type("bool", BaseType(name="bool"))
+    int = ctx.define_type("int", BaseType(name="int"))
+    float = ctx.define_type("float", BaseType(name="float"))
+    str = ctx.define_type("str", BaseType(name="str"))
+
+    basic_op(ctx, int, "__add__")
+    basic_op(ctx, int, "__sub__")
+    basic_op(ctx, int, "__mul__")
+    basic_op(ctx, int, "__pow__")
+    basic_op(ctx, int, "__mod__")
+    basic_op(ctx, int, "__and__")
+    basic_op(ctx, int, "__or__")
+    basic_op(ctx, int, "__xor__")
+    basic_op(ctx, float, "__add__")
+    basic_op(ctx, float, "__sub__")
+    basic_op(ctx, float, "__mul__")
+    basic_op(ctx, float, "__truediv__")
+    basic_op(ctx, str, "__add__")
diff --git a/midas/resolver/midas.py b/midas/resolver/midas.py
index 8fd1e66..d57ca70 100644
--- a/midas/resolver/midas.py
+++ b/midas/resolver/midas.py
@@ -2,6 +2,7 @@ from typing import Optional
 
 import midas.ast.midas as m
 from midas.checker.types import BaseType, SimpleType, Type
+from midas.resolver.builtin import define_builtins
 
 
 class MidasResolver(m.Stmt.Visitor[None], m.Expr.Visitor[Type]):
@@ -11,7 +12,7 @@ class MidasResolver(m.Stmt.Visitor[None], m.Expr.Visitor[Type]):
         self._types: dict[str, Type] = {}
         self._operations: dict[tuple[Type, str, Type], Type] = {}
 
-        self._define_builtin()
+        define_builtins(self)
 
     def get_type(self, name: str) -> Type:
         """Get a type from its name
@@ -47,19 +48,6 @@ class MidasResolver(m.Stmt.Visitor[None], m.Expr.Visitor[Type]):
         result: Optional[Type] = self._operations.get(operation)
         return result
 
-    def _define_builtin(self):
-        """Define builtin types and operations"""
-        self.define_type("bool", BaseType(name="bool"))
-        self.define_type("int", BaseType(name="int"))
-        self.define_type("float", BaseType(name="float"))
-        self.define_type("str", BaseType(name="str"))
-        self.define_operation(
-            left=self.get_type("int"),
-            operator="__add__",
-            right=self.get_type("int"),
-            result=self.get_type("int"),
-        )
-
     def define_type(self, name: str, type: Type) -> Type:
         """Define a type in the registry