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: [838, 632, -879, 404, 430, -851, -511, 943, -309, -266, -728, -729, -878, 400, 354]

[840, 630, -880, 400, 430, -850, -510, 940, -310, -270, -730, -730, -880, 400, 350]