Final answer:
The largest whole number that rounds to 400 when rounded to the nearest 100 is 400
Step-by-step explanation:
To determine the largest whole number that rounds to 400 when rounded to the nearest 100, we need to find the whole number that is closest to 400. Rounding to the nearest 100 means the number can be rounded to either 300 or 400. Since we are looking for the largest whole number, we round up to 400. Therefore, the largest whole number that rounds to 400 when rounded to the nearest 100 is 400.
Learn more about Rounding to the nearest 100