input: from typing import List
  
  def calculate_square_root(numbers: List[int]) -> List[float]:
      """ Given a list of positive integers, return a list of their square roots.
      >>> calculate_square_root([100, 25, 64])
      [10.0, 5.0, 8.0]
      >>> calculate_square_root([16, 9, 49])
      [4.0, 3.0, 7.0]
      """
output:     return [float(num ** 0.5) for num in numbers]