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: [-506, 266, 157, -508, 338, -421, 483, 616, -955, -561, -289, 820]

[-510, 270, 160, -510, 340, -420, 480, 620, -960, -560, -290, 820]