if you're going to round 572 to the nearest hundred you will look for the hundred value, so 5 is the hundred right and then you will look to the number next to it if it is 5 and up then you will round 5 to 6 and then 572 will be 600.
If you're going to round 572 to the nearest ten you will look to the ten value, so 7 is the ten value right and then you will look to the number next to it if it is 4 and lower then you will need to change the number next to it, so the answer will be 570.