diff --git a/Sprint-2/improve_with_caches/fibonacci/fibonacci.py b/Sprint-2/improve_with_caches/fibonacci/fibonacci.py
index 60cc667..746c38f 100644
--- a/Sprint-2/improve_with_caches/fibonacci/fibonacci.py
+++ b/Sprint-2/improve_with_caches/fibonacci/fibonacci.py
@@ -1,4 +1,11 @@
+cache = {}
+
+
 def fibonacci(n):
     if n <= 1:
         return n
-    return fibonacci(n - 1) + fibonacci(n - 2)
+    if n not in cache:
+        cache[n] = fibonacci(n - 1) + fibonacci(n - 2)
+        return cache[n]
+    else:
+        return cache[n]
diff --git a/Sprint-2/improve_with_caches/making_change/making_change.py b/Sprint-2/improve_with_caches/making_change/making_change.py
index 255612e..1a36c8b 100644
--- a/Sprint-2/improve_with_caches/making_change/making_change.py
+++ b/Sprint-2/improve_with_caches/making_change/making_change.py
@@ -10,6 +10,9 @@ def ways_to_make_change(total: int) -> int:
     return ways_to_make_change_helper(total, [200, 100, 50, 20, 10, 5, 2, 1])
 
 
+cache = {}
+
+
 def ways_to_make_change_helper(total: int, coins: List[int]) -> int:
     """
     Helper function for ways_to_make_change to avoid exposing the coins parameter to callers.
@@ -26,7 +29,14 @@ def ways_to_make_change_helper(total: int, coins: List[int]) -> int:
             if total_from_coins == total:
                 ways += 1
             else:
-                intermediate = ways_to_make_change_helper(total - total_from_coins, coins=coins[coin_index+1:])
+                key = (total - total_from_coins, tuple(coins[coin_index + 1 :]))
+                if key not in cache:
+                    cache[key] = ways_to_make_change_helper(
+                        total - total_from_coins, coins=coins[coin_index + 1 :]
+                    )
+                    intermediate = cache[key]
+                else:
+                    intermediate = cache[key]
                 ways += intermediate
             count_of_coin += 1
     return ways