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.
When rounding a number, you look at the digit to the right of the place value you are rounding to. In this case, 450 is being rounded to the nearest ten. The digit in the tens place is 5, which is greater than 4, so you would round up. Therefore, 450 rounded to the nearest ten is 450.
453.0
Anything from 450 to 549
You do nothing. 450 is already rounded to the nearest ten.
450
When rounding a number, you look at the digit to the right of the place value you are rounding to. In this case, 450 is being rounded to the nearest ten. The digit in the tens place is 5, which is greater than 4, so you would round up. Therefore, 450 rounded to the nearest ten is 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.
450
450
450.0