It is already rounded to the nearest ten as 450
450
It is: 500
440
453
You do nothing. 450 is already rounded to the nearest ten.
450
450
450 and above to the nearest 10 which is 460
As is. It is already rounded to the nearest tens place.
450
450
It is already rounded to the nearest ten as 450
450
450
It depends on whether you are rounding to the nearest integer, nearest 10, nearest 50 etc.
It is: 500