diff --git a/Calculator.py b/Calculator.py
new file mode 100644
index 0000000..f50b604
--- /dev/null
+++ b/Calculator.py
@@ -0,0 +1,43 @@
+'''
+As a user, I want to use a program which can calculate basic mathematical operations.
+So that I can add, subtract, multiply or divide my inputs.
+Acceptance Criteria:
+The calculator must support the Addition, Subtraction, Multiplication and Division operations.
+Define four functions in four files for each of them, with two float numbers as parameters.
+To calculate the answer, use math.ceil()  and get the next integer value greater than the result
+Create a menu using the print command with the respective options and take an input choice from the user.
+Using if/elif statements for cases and call the appropriate functions.
+Use try/except blocks to verify input entries and warn the user for incorrect inputs.
+Ask user if calculate numbers again. To implement this, take the input from user Y or N.
+Author=Bulent Caliskan date=01/02/2021
+'''
+#We import the modules that need to be imported.
+from math import ceil
+#creat calculator function with ceil modul
+# we also use try/except method for avoid mistakes
+def calculator():
+    while True:
+       try:
+            numbers=input("Enter the numbers you want to calculate(+/*-).Exmp= 4 + 5=> \n")
+            numberSplit=numbers.split(" ")
+            x,y,oparation=float(numberSplit[0]),float(numberSplit[2]),numberSplit[1]
+            if oparation=="+":
+                print(f"= {ceil(x+y)}")
+            elif oparation=="-":
+                print(f"= {ceil(x-y)}")
+            elif oparation=="/":
+                print(f"= {ceil(x/y)}")
+            elif oparation=="*":
+                print(f"= {ceil(x*y)}")
+            else:
+                print("You entered a wrong transaction.please dont forget space!")
+                continue
+       except:
+            print("You entered a wrong transaction")
+            continue
+       yn = input("Do you want to continue. Y/N ")
+       if yn == "Y" or yn == "y":
+           continue
+       else:break
+# call the function
+calculator()
diff --git a/Lcm.py b/Lcm.py
new file mode 100644
index 0000000..99bdc8b
--- /dev/null
+++ b/Lcm.py
@@ -0,0 +1,44 @@
+''''
+****The Least Common Multiple****
+As a user, I want to use a program which can calculate the least common multiple (L.C.M.) of four numbers.
+So that I can find the least common multiple (L.C.M.) of my inputs.
+Acceptance Criteria:
+Ask user to enter the four numbers.
+Use blocks to verify input entries and warn the user for Nan or non numerical inputs.try/except
+Calculate the least common multiple (L.C.M.) of four numbers
+Use gcd function in module of math
+Author= Bulent Caliskan  date=31/01/2021
+'''
+import math as m
+# put the 4 numbers we get from the user into a list.
+def numberList():
+    x=1
+    number_list=[]
+    while x<5:
+        try:
+            numbers=int(input(f"Enter {x}. number which you want to calculate "
+                  "\nthe least common multiple?"))
+            number_list.append(numbers)
+            x+=1
+        except:
+            print("You did not enter a number ")
+            continue
+    return number_list
+numbersList=numberList()
+#creat GCM for 4 numbers
+def gcm():
+    number_gcm=numbersList
+    glm1=m.gcd(number_gcm[0] , number_gcm[1])
+    glm2=m.gcd(glm1 , number_gcm[2])
+    glmFourNumbers=m.gcd(glm2 , number_gcm[3])
+    return  glmFourNumbers
+# creat LCM for 4 numbers and use math.gcd() modul
+def lcm():
+    number_lcm=numbersList
+    lcm1=int((number_lcm[0]*number_lcm[1])/(m.gcd(number_lcm[0],number_lcm[1])))
+    lcm2=int(lcm1*number_lcm[2]/(m.gcd(lcm1,number_lcm[2])))
+    lcmFourNumbers= int(lcm2*number_lcm[3]/(m.gcd(lcm2,number_lcm[3])))
+    return lcmFourNumbers
+print(f"LCM of your 4 numbers {lcm()}") # call the LCM function
+
+print(f"GCM of your 4 numbers {gcm()}")# call the GCM function
\ No newline at end of file
diff --git a/NumberGuessingGame.py b/NumberGuessingGame.py
new file mode 100644
index 0000000..843fef8
--- /dev/null
+++ b/NumberGuessingGame.py
@@ -0,0 +1,39 @@
+''''
+As a player, I want to play a game which I can guess a number the computer chooses in the range I chose.
+So that I can try to find the correct number which was selected by computer.
+Acceptance Criteria:
+Computer must randomly pick an integer from user selected a range, i.e., from A to B, where A and B belong to Integer.
+Your program should prompt the user for guesses
+if the user guesses incorrectly, it should print whether the guess is too high or too low.
+If the user guesses correctly, the program should print total time and total number of guesses.
+You must import some required modules or packages
+You can assume that the user will enter valid input.
+4- Mis Calculator
+Author=Bulent Caliskan date 01/02/2021
+'''
+#We import the modules that need to be imported.
+import random
+from timeit import default_timer as timer
+#start the game time
+start = timer()
+#creat guessFunc function with random modul
+def guessFunc():
+    print("Enter two numbers and try to guess the number to choose between. ")
+    a,b=int(input("Enter first number")),int(input("Enter second number"))
+    number=random.randint(a,b)
+    move = 0
+    while True:
+        move+=1
+        guess=int(input("Guess the number I kept "))
+        if number < guess:
+            print("You should enter a smaller number than your guess. ")
+            continue
+        elif number> guess:
+            print("You should enter a bigger number than your guess. ")
+            continue
+        else:
+            #finish the game time and return result with f string
+            end = timer()
+            return print(f"Congratulations, you got the correct guess in {end-start:.3} second and {move} times. ")
+#call the function
+guessFunc()
\ No newline at end of file
diff --git a/RandomPassword.py b/RandomPassword.py
new file mode 100644
index 0000000..f28c3ac
--- /dev/null
+++ b/RandomPassword.py
@@ -0,0 +1,65 @@
+''''
+As a user, I want to use a program which can generate random password and display the result on user interface.
+So that I can generate my password for any application.
+
+Acceptance Criteria:
+
+Password length must be 10 characters long.
+It must contain at least 2 upper case letter, 2 digits and 2 special symbols.
+You must import some required modules or packages.
+The GUI of program must contain at least a button and a label.
+The result should be display on the password label when the user click the generate button.
+Author= Bulent Caliskan  date= 31/01/2021
+'''
+import tkinter as tk
+
+import random
+
+# Function for calculation of password
+def passFunc():
+    entry.delete(0, 'end')
+
+    length=10
+    lower = "abcdefghijklmnopqrstuvwxyz"
+    upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    digits = "0123456789!@#$%^&*()"
+    password = ""
+    for i in range(0,3):
+        password=password+random.choice(lower)
+    for i in range(0,3):
+        password = password + random.choice(upper)
+    for i in range(0,4):
+        password = password + random.choice(digits)
+    ps=set(password)
+    return "".join(ps)
+# Function for generation of password
+def button():
+    password1=passFunc()
+    entry.insert(10,password1)
+
+# main function
+randompass=tk.Tk()
+# Title of your GUI window
+randompass.title("Random Password 1.1")
+randompass.geometry("400x200")
+
+# create label and entry to show
+# password generated
+rpLabel=tk.Label(randompass,text=" Press the button to generate a random password ",bg="white")
+rpLabel.pack(pady=20)
+
+passView = tk.Label(randompass, text=" Password ",fg="green",font=("Open Sans","10","bold"))
+passView.pack(pady=1)
+
+entry = tk.Entry(randompass,text= passFunc)
+entry.pack(pady=10)
+
+# create Button
+button =tk.Button(randompass, text = " GENARATE ",width=15,height =2,fg="green",command=button)
+button.pack(pady=5)
+
+# start the GUI
+randompass.mainloop()
+
+
+