diff --git a/src/math/computation.py b/src/math/computation.py
index 7f09784..9b6edbf 100644
--- a/src/math/computation.py
+++ b/src/math/computation.py
@@ -3,3 +3,41 @@ def gcd_recursive(a: int, b: int) -> int:
     if b == 0:
         return a
     return gcd_recursive(b, a % b)
+
+
+def lcm(a: int, b: int) -> int:
+    # Use absolute values to handle negative inputs; return 0 if either input is 0
+    return abs(a * b) // gcd(a, b) if a and b else 0
+
+
+def factorial(n: int) -> int:
+    if n < 0:
+        raise ValueError("Negative numbers do not have factorials.")
+    if n == 0 or n == 1:
+        return 1
+    return n * factorial(n - 1)
+
+
+def fibonacci(n: int) -> int:
+    if n < 0:
+        raise ValueError("Negative arguments not supported.")
+    if n == 0:
+        return 0
+    if n == 1:
+        return 1
+    return fibonacci(n - 1) + fibonacci(n - 2)
+
+
+def is_prime(n: int) -> bool:
+    if n <= 1:
+        return False
+    for i in range(2, int(n**0.5) + 1):
+        if n % i == 0:
+            return False
+    return True
+
+
+def gcd(x: int, y: int) -> int:
+    while y:
+        x, y = y, x % y
+    return x