mary rounds these numbers to the nearest hundred. which numbers does she round to 400?

Sorry Rosa... you did not give us the list of numbers to check.

To determine which numbers Mary rounds to 400 when rounding to the nearest hundred, we need to consider the range where the numbers fall.

When rounding to the nearest hundred, we look at the tens digit to decide whether to round up or down.

To round to 400, the numbers must fall between 350.5 and 449.5.

The numbers that Mary would round to 400 when rounding to the nearest hundred are:

- Any number greater than or equal to 350.5 (e.g., 351, 375, 398, 405)
- Any number less than or equal to 449.5 (e.g., 400, 425, 430, 449)

To determine which numbers Mary rounds to 400 when rounding to the nearest hundred, we need to understand the rounding rules.

When rounding to the nearest hundred, we consider the digit in the tens place. If the digit in the tens place is 5 or greater, we round up or increase the hundreds digit by 1. If the digit in the tens place is less than 5, we round down or leave the hundreds digit unchanged.

In this case, Mary rounds to 400. So, let's look at the numbers between 350 and 449 to see which ones round to 400.

350: The digit in the tens place is 5 or greater, so it rounds up to 400.
351: The digit in the tens place is 5 or greater, so it rounds up to 400.
...
398: The digit in the tens place is less than 5, so it rounds down to 300.
399: The digit in the tens place is less than 5, so it rounds down to 300.
400: The digit in the tens place is 0, so it rounds down to 400.
401: The digit in the tens place is 0, so it rounds down to 400.
...
449: The digit in the tens place is 5 or greater, so it rounds up to 500.

Therefore, the numbers that Mary rounds to 400 when rounding to the nearest hundred are 350, 351, 400, and 401.