Answer:
The least whole number can be 350 and the greatest whole number can be 449.
Step-by-step explanation:
Consider the provided information.
We need to find the least whole number that's rounds to 400 when rounding to the nearest hundred,
Rule of rounding a number.
If the number on the right side of rounding digit is 0, 1, 2, 3, 4 then no need to change the rounding digit and change the rest of the digit right to rounding digit with 0.
If the number on the right side of rounding digit is 5, 6, 7, 8, 9 then rounding digit rounds up by one number and change the rest of the digit right to rounding digit with 0.
Now, consider the number 400.
We want the least number so the number at the hundreds place should be 3.
We want to increase the number at the hundreds place by 1 so the least possible choice for tens place is 5.
Hence, the least whole number can be 350.
Now we want the greatest whole number that's rounds to 400.
Similarly, for greatest whole number the number should be greater than 400. We don't want to increase the number at the hundreds place so the greatest possible choice for tens place is 4. To make it greatest whole number place 9 at once place.
Hence, the greatest whole number can be 449.
