def is_keys_str_decimals(dictionary: dict):
    """
        Checks if the keys are string decimals
    Args:
        dictionary: Dictionary object to check

    Returns:
        True if keys are numerical strings
    """
    keys = dictionary.keys()
    are_decimals = [isinstance(k, str) and k.isdecimal() for k in keys]
    return all(are_decimals)