Definition: In this task you will be given a list of integers. You should round each integer to the nearest tens place. That means you should round the number to the nearest multiple of 10.
Input: [-921, 591, -665, -689, -30, -386, -460, 664, -669, 733, -729, 518, 377]

[-920, 590, -660, -690, -30, -390, -460, 660, -670, 730, -730, 520, 380]