(i) The number is 1046. Its digit at the hundreds place is 0 < 5.
So, the given number is rounded off to the nearest thousand as 1000.
(ii) The number is 973. Its digit at the hundreds place is 9 > 5.
So, the given number is rounded off to the nearest thousand as 1000.
(iii) The number is 5624. Its digit at the hundreds place is 6 > 5.
So, the given number is rounded off to the nearest thousand as 6000.
(iv) The number is 4368. Its digit at the hundreds place is 3 < 5.
So, the given number is rounded off to the nearest thousand as 4000.