It depends on whether you are rounding to the nearest integer, nearest 10, nearest 50 etc.
The smallest whole number that can be rounded to 500 is 450.
You do nothing. 450 is already rounded to the nearest ten.
450
Oh, dude, you're hitting me with the big math questions, huh? Okay, so, like, when you round 450, you're looking at the digit right after the 5, which is 0. And since 0 is less than 5, you just leave the 5 as is. So, 450 rounded is still just 450. Easy peasy, right?
Because 450 is nearer to zero than it is to 1,000.
450 whole numbers.
The smallest whole number that can be rounded to 500 is 450.
Numbers from 450 to 549.
500
Any of the integers from 450 to 499 can be rounded to the nearest 100 as 500
450 to 549
500
453
500
450 to 549
450
500