diff --git a/problems/easy/easy_q1.py b/problems/easy/easy_q1.py
index 50fa9f4..2fd320a 100644
--- a/problems/easy/easy_q1.py
+++ b/problems/easy/easy_q1.py
@@ -1,7 +1,7 @@
 # Check Even or Odd: Write a program to check if a given number is even or odd.
 
 num = int(input("Enter a number: "))
-if (num % 2) != 0:
+if (num  % 2) != 0:
    print("{0} is Odd".format(num))
 else:
    print("{0} is Even".format(num))
diff --git a/problems/easy/easy_q2.py b/problems/easy/easy_q2.py
index 8c49830..8effa89 100644
--- a/problems/easy/easy_q2.py
+++ b/problems/easy/easy_q2.py
@@ -1,11 +1,11 @@
 # Find the Largest Number: Accept two numbers and print the larger one.
 def largest_of_two(a, b):
     if a > b:
-        return b   
-    else:
-        return a
+        print(a)   
+    else: 
+        print(b)
+    
 if __name__ == "__main__":
     num1 = int(input("Enter the First Number :"))
     num2 = int(input("Enter the Second Number :"))
-    res = largest_of_two(num1,num1)
-    print(res)
\ No newline at end of file
+    largest_of_two(num1,num2)
\ No newline at end of file
diff --git a/problems/easy/easy_q3.py b/problems/easy/easy_q3.py
index 8df3340..ab99555 100644
--- a/problems/easy/easy_q3.py
+++ b/problems/easy/easy_q3.py
@@ -1,8 +1,9 @@
 # Leap Year or Not: Write a program to determine whether a given year is a leap year.
 def is_leap_year(year):
-    if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:   
-        return "Not a Leap Year"   
-    return "Leap Year"
+    if year % 400 == 0 and year % 100 == 0 or year % 4 == 0:   
+        return "Leap Year"  
+    else: 
+        return "Not a Leap Year"
 if __name__ == "__main__":
     
     num = int(input("Enter the number :"))
diff --git a/problems/easy/easy_q4.py b/problems/easy/easy_q4.py
index 8b1dc9d..c4e3ab8 100644
--- a/problems/easy/easy_q4.py
+++ b/problems/easy/easy_q4.py
@@ -1,16 +1,15 @@
 # Positive, Negative, or Zero: Accept a number and check if it is positive, negative, or zero.
 def check_number(num):
     if num > 0:
-        print("Negative")  
-    elif num < 0:
         print("Positive")  
+    elif num < 0:
+        print("Negative")  
     else:
-        print("Number is negative")   
+        print("Number is zero")   
         
 if __name__ == "__main__":
-    num = input("Enter the Number : ")
-    res = check_number(num)
-    print(res)
+    num = int(input("Enter the Number : "))
+    check_number(num)
     
     
     
diff --git a/problems/easy/easy_q5.py b/problems/easy/easy_q5.py
index fbfab0b..06f5b5d 100644
--- a/problems/easy/easy_q5.py
+++ b/problems/easy/easy_q5.py
@@ -1,17 +1,19 @@
 # Grading System: Write a program that takes a student’s marks as input and prints the grade (A, B, C, or F) based on given thresholds.
 
 def grade_system(marks):
-    if marks >= 90:
-        return "B"  
-    elif marks >= 80:
-        return "A"   
-    elif marks >= 70:
-        return "F"   
-    else:
+    if marks < 100 and marks >= 90:
+        return "A"  
+    elif marks < 90 and marks >= 80:
+        return "B"   
+    elif marks <80 and marks >= 70:
         return "C"  
+    elif marks < 0 or marks > 100:
+        return "Invalid marks" 
+    else:
+        return "F"  
     
 if __name__ == "__main__":
-      num = input("Enter the Mark : ")
+      num = int(input("Enter the Mark : "))
       res = grade_system(num)
       print(res)
       
diff --git a/problems/easy/easy_q6.py b/problems/easy/easy_q6.py
index 3ac65c7..7b3cef9 100644
--- a/problems/easy/easy_q6.py
+++ b/problems/easy/easy_q6.py
@@ -3,9 +3,8 @@ def print_numbers(n):
     i = 1
     while i <= n:
         print(i)
-        n -= 1   
+        i += 1   
 
 if __name__ == "__main__":
     num = int(input("Enter the Number "))
-    res = print_numbers(num)
-    print(res)
+    print_numbers(num)
\ No newline at end of file
diff --git a/problems/easy/easy_q7.py b/problems/easy/easy_q7.py
index 8efa72e..5b3097e 100644
--- a/problems/easy/easy_q7.py
+++ b/problems/easy/easy_q7.py
@@ -3,10 +3,11 @@ def sum_of_digits(num):
     total = 0
     while num > 0:
         total += num % 10
-        num = num + 10  
-    return total
+        num //= 10 
+    print(total)
 
 if __name__ == "__main__":
     num = int(input("Enter the Number : "))
+    sum_of_digits(num)
     
     
diff --git a/problems/medium/m1.py b/problems/medium/m1.py
index dddb03c..95a8035 100644
--- a/problems/medium/m1.py
+++ b/problems/medium/m1.py
@@ -2,25 +2,26 @@
 Create a menu to perform basic mathematical operations (addition, subtraction, multiplication, division, modulo) on two numbers.
 
 '''
-def math_operations_menu():
-    print("1. Add")
-    print("2. Subtract")
-    print("3. Multiply")
-    print("4. Divide")
-    print("5. Modulo")
-    choice = int(input("Enter your choice: "))
-
-    a, b = map(int, input("Enter two numbers: ").split())
+def math_operations_menu(choice):
+    a, b = map(int, input("Enter two numbers: ").split(sep=","))
 
     if choice == 1:
         print("Subtraction:", a - b)   
     elif choice == 2:
         print("Addition:", a + b)   
     elif choice == 3:
-        print("Division:", a / b)   
-    elif choice == 4:
         print("Multiplication:", a * b)   
+    elif choice == 4:
+        print("Division:", a / b)   
     elif choice == 5:
-        print("Modulo:", a // b)   
+        print("Modulo:", a % b)   
     else:
         print("Invalid option")
+
+print("1. Add")
+print("2. Subtract")
+print("3. Multiply")
+print("4. Divide")
+print("5. Modulo")
+choice = int(input("Enter your choice: "))
+math_operations_menu(choice)