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: [-821, -814, -839, 124, -873, -528, -810, -436, -566, -629, 390]

[-820, -810, -840, 120, -870, -530, -810, -440, -570, -630, 390]