There is no answer to this question. For any number that you care to name, I can pick one that is halfway between your number and 450 - namely the average of your number and 450 or (450+your number)/2. Being halfway between your number and 450, it is clearly nearer to 450. And then, I can find another number that is closer to 450 than that number and so on, for ever.
453.0
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?
Anything from 450 to 549
You do nothing. 450 is already rounded to the nearest ten.
450
One answer is 450
453.0
450
450 and above to the nearest 10 which is 460
500
What is the nearest 100 of 450
450
As is. It is already rounded to the nearest tens place.
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?
450
450
450.0