def divide_by_one(num): # Is whole number
    return float(num).is_integer()

def divide_by_two(num): # Take last digit, divide by two only on that
    return _get_last_digit(num) % 2 == 0

def divide_by_three(num): # Sum each digit in number, then check divisibility of that number
    return _sum_digits(num) % 3 == 0

def divide_by_five(num): # If last digit is a zero or a five return true
    last_digit = _get_last_digit(num)
    return last_digit == 0 or last_digit == 5

def divide_by_nine(num): # Sum each digit in number, then check divisibility of that number
    return _sum_digits(num) % 9 == 0

def _get_last_digit(num):
    return int(f"{num}"[-1])

def _sum_digits(num):
    num_string = f"{num}"
    num_sum = 0
    for digit_char in num_string:
        num_sum += int(digit_char)
    return num_sum