Answer:649Step-by-step explanation:To find the largest 3-digit number that rounds to 600 when rounded to the nearest hundreds, follow this:Numbers from 550 to 649 round to 600 when rounded to the nearest hundred.Because:550 is the lowest number that rounds to 600.649 is the highest number that still rounds to 600.650 would round up to 700.Answer: 649 is the largest 3-digit number that rounds off as 600 to the nearest hundreds.