human
round to another significant digit.
assistant
Here is a Python function to round to another significant digit

import math

def round_to_sig_digits(number, sig_digits):
    """
    Round a number to a specified number of significant digits.

    :param number: The number to round.
    :param sig_digits: The number of significant digits.
    :return: The rounded number.
    """

    return round(number, sig_digits - int(math.floor(math.log10(abs(number)))) - 1)

# Enter the number and the number of significant digits
number = 123456789
sig_digits = 3

# Calling the function
print((round_to_sig_digits(number, sig_digits)))

#Example Output
# 123000000

#Remember to inspect code for bugs.