diff --git a/src/tools/math.py b/src/tools/math.py
index f98c5b7..6a58baf 100644
--- a/src/tools/math.py
+++ b/src/tools/math.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 import math
 from decimal import Decimal, ROUND_HALF_UP
+from typing import Iterable
 
 
 def round_half_up(number: int | float) -> int:
@@ -16,3 +17,12 @@ def get_factors(num: int) -> set:
             f.add(num // x)
 
     return f
+
+
+def mul(ints: Iterable[int]) -> int:
+    """similar to sum(), just for multiplication"""
+    ret = 1
+    for x in ints:
+        ret *= x
+
+    return ret