The most common answer is:

```
num1 = int(input("What is the first number?: "))
num2 = int(input("What is the second number?: "))
mathtype = input("Choose an operation (add, subtract, multiply): ").lower()
def do_math(a, b, operation):
if operation == "add":
result = a + b
print(f"{a} + {b} = {result}")
elif operation == "subtract":
result = a - b
print(f"{a} - {b} = {result}")
elif operation == "multiply":
result = a * b
print(f"{a} * {b} = {result}")
else:
print("Invalid operation selected.")
do_math(num1, num2, mathtype)
```

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