diff --git a/maths/greedy_coin_change.py b/maths/greedy_coin_change.py
index 5a7d9e8d8..5233ee1cb 100644
--- a/maths/greedy_coin_change.py
+++ b/maths/greedy_coin_change.py
@@ -41,7 +41,7 @@ Following is minimal   change for 456 :
 """
 
 
-def find_minimum_change(denominations: list[int], value: int) -> list[int]:
+def find_minimum_change(denominations: list[int], value: str) -> list[int]:
     """
     Find the minimum change from the given denominations and value
     >>> find_minimum_change([1, 5, 10, 20, 50, 100, 200, 500, 1000,2000], 18745)
@@ -75,7 +75,7 @@ def find_minimum_change(denominations: list[int], value: int) -> list[int]:
 if __name__ == "__main__":
 
     denominations = list()
-    value = 0
+    value = "0"
 
     if (
         input("Do you want to enter your denominations ? (yY/n): ").strip().lower()
diff --git a/maths/triplet_sum.py b/maths/triplet_sum.py
index 22fab17d3..af77ed145 100644
--- a/maths/triplet_sum.py
+++ b/maths/triplet_sum.py
@@ -19,7 +19,7 @@ def make_dataset() -> tuple[list[int], int]:
 dataset = make_dataset()
 
 
-def triplet_sum1(arr: list[int], target: int) -> tuple[int, int, int]:
+def triplet_sum1(arr: list[int], target: int) -> tuple[int, ...]:
     """
     Returns a triplet in the array with sum equal to target,
     else (0, 0, 0).
diff --git a/maths/two_sum.py b/maths/two_sum.py
index 5209acbc7..12ad332d6 100644
--- a/maths/two_sum.py
+++ b/maths/two_sum.py
@@ -31,7 +31,7 @@ def two_sum(nums: list[int], target: int) -> list[int]:
     >>> two_sum([3 * i for i in range(10)], 19)
     []
     """
-    chk_map = {}
+    chk_map: dict[int, int] = {}
     for index, val in enumerate(nums):
         compl = target - val
         if compl in chk_map: