Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
[-83, 53, -48, 8]
Solution: [-80, 50, -50, 10]
Reason: The output correctly rounds each integer in the input list to the nearest ten. So this is a good example.

Now, solve this instance: [538, 309, 478, 799, -852, 970, 643, -257, -550, -377, 835, 482, 842]
Student:
[540, 310, 480, 800, -850, 970, 640, -260, -550, -380, 840, 480, 840]