diff --git a/.gitignore b/.gitignore
index fa9845f..8521912 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 .idea/*
-__pycache__
\ No newline at end of file
+__pycache__
+/venv/
+mathterpreter.egg-info
diff --git a/mathterpreter/_parser.py b/mathterpreter/_parser.py
index 2450677..80670b6 100644
--- a/mathterpreter/_parser.py
+++ b/mathterpreter/_parser.py
@@ -1,5 +1,5 @@
 from mathterpreter.nodes import *
-from mathterpreter.tokens import TokenType, Token
+from mathterpreter.tokens import TokenType, Token, FORMATS
 from mathterpreter.exceptions import MathSyntaxError
 from typing import List
 
@@ -11,6 +11,7 @@ def __init__(self, tokens: List[Token]):
         self._token = None
         self._index = -1
         self._iterate_token()
+        print(tokens)
 
     def _iterate_token(self):
         try:
@@ -31,20 +32,20 @@ def _addition_subtraction_base(self):
         if self._token is None:
             output = ''.join([z.__str__() for z in self.token_list])
             raise MathSyntaxError("Expression expected", f"{output}\n{'^^^'.rjust(len(output) + 3)}")
-        result = self._multiplication_division()
+        result = self._multiplication_division_modulo()
         while self._token is not None:
             if self._token.type == TokenType.ADDITION_OPERATOR:
                 self._iterate_token()
-                result = AdditionNode(result, self._multiplication_division())
+                result = AdditionNode(result, self._multiplication_division_modulo())
             elif self._token.type == TokenType.SUBTRACTION_OPERATOR:
                 self._iterate_token()
-                result = SubtractionNode(result, self._multiplication_division())
+                result = SubtractionNode(result, self._multiplication_division_modulo())
             else:
                 break
 
         return result
 
-    def _multiplication_division(self):
+    def _multiplication_division_modulo(self):
         result = self._exponentiation_root()
 
         while self._token is not None:
@@ -54,6 +55,9 @@ def _multiplication_division(self):
             elif self._token.type == TokenType.DIVISION_OPERATOR:
                 self._iterate_token()
                 result = DivisionNode(result, self._exponentiation_root())
+            elif self._token.type == TokenType.MODULO_OPERATOR:
+                self._iterate_token()
+                result = ModuloNode(result, self._exponentiation_root())
             elif self._token.type == TokenType.OPENING_BRACKET:
                 result = MultiplicationNode(result, self._literal_polarity())
             else:
diff --git a/mathterpreter/lexer.py b/mathterpreter/lexer.py
index 23f2fc9..3189bbf 100644
--- a/mathterpreter/lexer.py
+++ b/mathterpreter/lexer.py
@@ -26,6 +26,8 @@ def expand(compact_dict):
     "^": lambda: TokenType.POWER_OPERATOR,
     "(": lambda: TokenType.OPENING_BRACKET,
     ")": lambda: TokenType.CLOSING_BRACKET,
+    "!": lambda: TokenType.FACTORIAL_OPERATOR,
+    "%": lambda: TokenType.MODULO_OPERATOR,
 }
 CONSTANTS = {
     ("pi", "π"): lambda: math.pi,
diff --git a/mathterpreter/nodes.py b/mathterpreter/nodes.py
index 93d86fe..45b2497 100644
--- a/mathterpreter/nodes.py
+++ b/mathterpreter/nodes.py
@@ -105,3 +105,14 @@ def __repr__(self):
 
     def evaluate(self) -> float:
         return self.first_operand.evaluate() ** self.second_operand.evaluate()
+
+@dataclass
+class ModuloNode(OperationNode):
+    def __repr__(self):
+        return f"({self.first_operand}%{self.second_operand})"
+
+    def evaluate(self) -> float:
+        return self.first_operand.evaluate() % self.second_operand.evaluate()
+
+
+
diff --git a/mathterpreter/tokens.py b/mathterpreter/tokens.py
index 516f05c..72a2d02 100644
--- a/mathterpreter/tokens.py
+++ b/mathterpreter/tokens.py
@@ -14,6 +14,7 @@ class TokenType:
     POWER_OPERATOR = 7
     OPENING_BRACKET = 8
     CLOSING_BRACKET = 9
+    MODULO_OPERATOR = 10
 
 
 FORMATS = {
@@ -27,7 +28,8 @@ class TokenType:
     TokenType.SQRT_OPERATOR: "√",
     TokenType.POWER_OPERATOR: "^",
     TokenType.OPENING_BRACKET: "(",
-    TokenType.CLOSING_BRACKET: ")"
+    TokenType.CLOSING_BRACKET: ")",
+    TokenType.MODULO_OPERATOR: "%",
 }