Doubling the numbers in an array with a for loop

I do know that I have to multiply but none of my answers are coming out right. can anyone assist with what I am doing wrong?

numbers = [10, 25, 50]

doubled_numbers = []

for the_numbers in numbers:
  if the_numbers * 2:
    doubled_numbers.insert(the_numbers)
else:
        print("the original numbers: ", the_numbers)

print(doubled_numbers)

I get a syntax error:

Traceback (most recent call last):
  File "/Users/korigray/Desktop/lesson_three/main.py", line 10, in <module>
    doubled_numbers.insert(the_numbers)
TypeError: insert expected 2 arguments, got 1
korigray@Koris-MBP-2 lesson_three %

I am not sure of what I am missing.