diff --git a/calculator.py b/calculator.py
new file mode 100644
index 0000000..a64607a
--- /dev/null
+++ b/calculator.py
@@ -0,0 +1,20 @@
+
+class Calculator:
+    def add(self, a, b):
+        # No type checking or validation
+        return a + b
+
+    def subtract(self, a, b):
+        # Could use better error handling
+        return a - b
+
+    def multiply(self, a, b):
+        # Missing docstring and input validation
+        return a * b
+
+    def divide(self, a, b):
+        # Basic division without proper error handling
+        return a / b
+
+# Global instance - potential improvement area
+calculator = Calculator()
diff --git a/utils.py b/utils.py
new file mode 100644
index 0000000..865a2c1
--- /dev/null
+++ b/utils.py
@@ -0,0 +1,17 @@
+
+def validate_number(num):
+    # Basic validation without proper type checking
+    try:
+        float(num)
+        return True
+    except:
+        return False
+
+def format_result(result):
+    # Simple formatting without proper rounding or precision handling
+    return str(result)
+
+def parse_input(input_str):
+    # Basic parsing without proper error handling
+    parts = input_str.split()
+    return float(parts[0]), parts[1], float(parts[2])