Zero.
Because 450 is nearer to zero than it is to 1,000.
550
This depends what you are rounding 450 to. If its to the nearest hundred it's 500. If it is to the nearest whole number or tens place then it is 450.
1000-450 equal to = 550
You do nothing. 450 is already rounded to the nearest ten.
Because 450 is nearer to zero than it is to 1,000.
550
450
It is already rounded to the nearest ten as 450
As is. It is already rounded to the nearest tens place.
This depends what you are rounding 450 to. If its to the nearest hundred it's 500. If it is to the nearest whole number or tens place then it is 450.
450
450
450.0
1000-450 equal to = 550
45/100 of 1000 = 1000*45/100 = 450
4000