You do nothing. 450 is already rounded to the nearest ten.
450
Because 450 is nearer to zero than it is to 1,000.
The smallest whole number that can be rounded to 500 is 450.
450
450
450
450
You do nothing. 450 is already rounded to the nearest ten.
450
450
450
As is. It is already rounded to the nearest tens place.
It is already rounded to the nearest ten as 450
450
It is: 500
450