This script always says that i made an invalid choice. If statement might be ignored

I have been trying to make this calculator work but it always says that my choice is invalid. I tried valid numbers and for some reason it doesn't work. Any help would be appreciated. I'm still new to python and to programming in general. Thanks.

#Calculator
print("1.Addition")
print("2.Substraction")
print("3.Multiplication")
print("4.Divison")
#Choose the calculation
Choice=int(input("Enter your choice (1/2/3/4): "))
#Inserting the numbers
Num1=float(input("Insert your first number: "))
Num2=float(input("Insert your second number: "))

if Choice == '1':
    ans= Num1 + Num2
    print("Your answer is: ",ans)

elif Choice == '2':
    ans= Num1 - Num2
    print("Your answer is: ",ans)

elif Choice == '3':
    ans= Num1*Num2
    print("Your answer is: ",ans)

elif Choice == '4':
    ans= Num1/Num2
    print("Your answer is: ",ans)

else:
    print("Invalid choice. ")