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: [13, -760, 351, 426, 887, 100, -517, -539, 405, 934, -145, 258, -721]

[10, -760, 350, 430, 890, 100, -520, -540, 400, 930, -140, 260, -720]