450
You do nothing. 450 is already rounded to the nearest ten.
450
450
As is. It is already rounded to the nearest tens place.
It is already rounded to the nearest ten as 450
440
450
453
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.
490