diff --git a/Calculator.py b/Calculator.py
new file mode 100644
index 0000000..6069cff
--- /dev/null
+++ b/Calculator.py
@@ -0,0 +1,66 @@
+
+import math
+
+def add(num1, num2):
+    return (math.ceil(num1 + num2))   # mathceil ile yuvarlamayi buradaki fonksiyonlarda yapiyorum
+def subtract(num1, num2):
+    return (math.ceil(num1 - num2))
+def multiply(num1, num2):
+    return (math.ceil(num1 * num2))
+def divide(num1, num2):
+    return (math.ceil(num1 / num2))
+
+def calculate():        # hangi islemi yapacagimizi seciyoruz
+    print("Please select the type of calculation -\n" \
+          "1. Add\n" \
+          "2. Subtract\n" \
+          "3. Multiply\n" \
+          "4. Divide\n")
+
+    while True:
+        select = input("Select type of calculation 1, 2, 3, 4 :")
+        try:
+            assert 0 < int(select) < 5         #baska sayi ve rakam girislerinde uyarip tekrar ettiriyoruz
+            break
+        except:
+            print("invalid entry!")
+            continue
+    while True:
+        number_1 = input("Enter first number: ")
+        number_2 = input("Enter second number: ")
+        try:
+            number_1 = float(number_1)         # rakam girilmezse uyarip tekrar ettiriyoruz
+            number_2 = float(number_2)
+            break
+        except:
+            print("invalid entries")
+            continue
+    if int(select) == 1:
+        print(number_1, "+", number_2, "=", #islemine gore yukaridaki toplama, cikarrma vs fonsiyonlari cagiriyoruz
+            add(number_1, number_2))
+
+    elif int(select) == 2:
+        print(number_1, "-", number_2, "=",
+            subtract(number_1, number_2))
+
+    elif int(select) == 3:
+         print(number_1, "*", number_2, "=",
+            multiply(number_1, number_2))
+
+    elif int(select) == 4:
+        try:
+            assert number_2 != float(0)
+        except :                                    # 0'a bolumde uyarip, bastan aliyoruz
+            print("Ooops, ZeroDivisionError!!! ")
+        else:
+            print(number_1, "/", number_2, "=",
+            divide(number_1, number_2))
+
+    new_operation = input("Would you like a new calculation, key y/n: ")
+    if new_operation == "y":
+        calculate()
+    elif new_operation == "n":                      # yeni islem yapmak istiyormuyuz
+        input("\nPress the enter key to exit")
+    else:
+        print("Invalid entry byebye..")
+calculate()
diff --git a/LCM.py b/LCM.py
new file mode 100644
index 0000000..06f17e1
--- /dev/null
+++ b/LCM.py
@@ -0,0 +1,27 @@
+
+
+from math import gcd
+
+while True:
+    print ("Enter 4 number please,")
+    num1 = input ("Enter number 1: ")
+    num2 = input ("Enter number 2: ")
+    num3 = input("Enter number 3: ")
+    num4 = input("Enter number 4: ")
+    try:
+        num1 = int(num1)
+        num2 = int(num2)
+        num3 = int(num3)
+        num4 = int(num4)
+        break
+    except ValueError:               # sayi girilmez ise uyarip, tekrar ettiriyoruz
+        print("invalid entries")
+        continue
+
+a = [num1, num2, num3, num4]
+print ("Entered Numbers :", a)
+lcm = a[0]
+for i in a[:]:
+  lcm = lcm*i//gcd(lcm, i)
+print("The L.C.M. of :", num1, '-', num2,'-', num3,'-', num4,  "is", lcm )
+
diff --git a/PasswordGen.py b/PasswordGen.py
new file mode 100644
index 0000000..3498c27
--- /dev/null
+++ b/PasswordGen.py
@@ -0,0 +1,33 @@
+
+import random
+import string
+from tkinter import *
+from tkinter.ttk import *
+
+
+root = Tk()
+root.title("Password Generator App")
+root['background']='#856ff8'
+root.geometry("450x450")
+
+
+pass_str = StringVar()
+def generate():      # 2'ser tane  buyuk harf, rakam ve karakteri seciyoruz, toplam 6 ediyor
+    random_source = string.ascii_letters + string.digits + string.punctuation
+    password =  random.choice(string.ascii_uppercase) + random.choice(string.ascii_uppercase)
+    password += random.choice(string.digits) + random.choice(string.digits)
+    password += random.choice(string.punctuation) + random.choice(string.punctuation)
+
+    for i in range(4):          #kalan 4 karakteri yukaridaki kumeden aliyorum
+        password += random.choice(random_source)
+
+    pass_str.set(password)
+
+
+Label(root, text="Password Generator Application", font="Lucida 20 bold").pack()
+
+Button(root, text="Generate Password",  command=generate).pack(pady=7)
+
+Entry(root, textvariable=pass_str).pack(pady=2)
+root.mainloop()
+
diff --git a/SayiTahmin.py b/SayiTahmin.py
new file mode 100644
index 0000000..a34b99a
--- /dev/null
+++ b/SayiTahmin.py
@@ -0,0 +1,22 @@
+
+
+import random
+import time
+
+n = random.randint(1, 20)
+tahmin = int(input("1 ve 20 arasinda bir sayi giriniz: "))
+start_time = time.time()
+count = 0
+
+while n != "tahmin":
+    count += 1
+    if tahmin < n:
+        print ("tahminin dusuk")
+        tahmin = int(input("1 ve 20 arasinda bir sayi giriniz: "))
+    elif tahmin > n:
+        print ("tahminin yuksek")
+        tahmin = int(input("1 ve 20 arasinda bir sayi giriniz: "))
+    else:
+        print ("Dogru!", int(time.time() - start_time), "saniyede ve", count, "ncu tahminde bildiniz...")
+        #print  (int(time.time() - start_time), "saniyede bildiniz")
+        break
\ No newline at end of file