import math


def myFloor(x, multiple):
    """

    :synopsis: Round down to a multiple of 10/100/1000...
    :param float x: A number
    :param int multiple: Power of 10 indicating how many places to round
    :returns: int

    This emulates the `math.floor` function but
    rounding down a positive power of 10 (i.e. 10, 100, 1000...)

    For example, myFloor(1975,100) returns 1900.

    """

    y = x/multiple
    return int(math.floor(y) * multiple)