def multiply_values(dictionary: dict, num: int) -> dict:
    """Multiplies each value in `dictionary` by `num`

    Args:
        dictionary (dict): subject dictionary
        num (int): multiplier

    Returns:
        dict: mapping of keys to values multiplied by multiplier
    """
    return (
        {key: value * num for key, value in dictionary.items()}
        if dictionary is not None
        else {}
    )