When you round 4, 398, 202 to the nearest 100 it means to ignore the 4,398 and just look at 202. You could either round to 200 or 300 since you want to round to the nearest 100. Since the ones place is 2, you round the number to 200.
The answer is 4,398,200. So, first look at the hundreds place which is 2, no look at one place right of the number, which is 0, so 0 is less than 5 so we do nothing. We can write the numbers before that, so the numbers are 4,398. Now add 2 then 2 0's. Like this 4,398,200.
