It is 849.
800
800
800
750 to 849
800
800
800
It is: 850 and not 849
800
800
800
849 is the greatest integer that can be rounded off to 800 to the nearest hundred.
It then is 800 because 49 is less than 50
840
That's correct if rounding to the second greatest place value, but not the greatest. The greatest place value in a three digit number is the hundreds place. 849 rounded to the nearest hundred is 800.
800
800