diff --git a/Sprint-2/improve_with_caches/fibonacci/fibonacci.py b/Sprint-2/improve_with_caches/fibonacci/fibonacci.py
index 60cc667..143fb5b 100644
--- a/Sprint-2/improve_with_caches/fibonacci/fibonacci.py
+++ b/Sprint-2/improve_with_caches/fibonacci/fibonacci.py
@@ -1,4 +1,12 @@
+memo = {}
+
 def fibonacci(n):
+    if n in memo:
+        return memo[n]
+    
     if n <= 1:
         return n
-    return fibonacci(n - 1) + fibonacci(n - 2)
+    result = fibonacci(n - 1) + fibonacci(n - 2)
+    memo[n] = result
+
+    return result
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..8f412e0 100644
--- a/Sprint-2/improve_with_caches/making_change/making_change.py
+++ b/Sprint-2/improve_with_caches/making_change/making_change.py
@@ -1,32 +1,51 @@
-from typing import List
 
+from typing import List, Dict, Tuple
+
+# Pre-create only
+_BASE_COINS: List[int] = [200, 100, 50, 20, 10, 5, 2, 1]
+
+cache: Dict[Tuple[int, int], int] = {}
 
 def ways_to_make_change(total: int) -> int:
-    """
-    Given access to coins with the values 1, 2, 5, 10, 20, 50, 100, 200, returns a count of all of the ways to make the passed total value.
+    cache.clear()
+    # suffix_id == 0 identifies [200, 100, 50, 20, 10, 5, 2, 1]
+    return ways_to_make_change_helper(total, start_index: 0)
 
-    For instance, there are two ways to make a value of 3: with 3x 1 coins, or with 1x 1 coin and 1x 2 coin.
-    """
-    return ways_to_make_change_helper(total, [200, 100, 50, 20, 10, 5, 2, 1])
 
+def ways_to_make_change_helper(total: int, start_index: int) -> int:
+    if total == 0:
+        return 1
 
-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.
-    """
-    if total == 0 or len(coins) == 0:
+    if start_index >= len(_BASE_COINS):
         return 0
 
+    coin = _BASE_COINS[start_index]
+
+    if start_index == len(_BASE_COINS) - 1:
+        return 1 if total % coin == 0 else 0
+
+    key = (total, start_index) 
+    if key in cache:
+        return cache[key]
+
     ways = 0
-    for coin_index in range(len(coins)):
-        coin = coins[coin_index]
+
+    for coin_index in range(start_index, len(_BASE_COINS)): 
+        coin = _BASE_COINS[coin_index]
         count_of_coin = 1
+
         while coin * count_of_coin <= total:
             total_from_coins = coin * count_of_coin
+
             if total_from_coins == total:
                 ways += 1
             else:
-                intermediate = ways_to_make_change_helper(total - total_from_coins, coins=coins[coin_index+1:])
-                ways += intermediate
+                ways += ways_to_make_change_helper(
+                    total - total_from_coins,
+                    coin_index + 1
+                )
+
             count_of_coin += 1
+
+    cache[key] = ways
     return ways