round 90 to the nearest ten
300
7675 rounded to the nearest 100 is 7700.
Half of 100 is 50, so the largest number that ought to round to 400 to the nearest 100 would be 400 + 50 = 450; however, numbers exactly half way round up, so the largest whole number that rounds to 400 is one less than this, namely 450 - 1 = 449.
200
350 to 449
350 to 449 -- 100 numbers
It is 450.
It is: 450
Looking at the final two digits, as they are 49, they figures round down because of the 4, so the result is 400.
350 and up to
500
Technically, if you were trying to round to the nearest hundreds place, then no. You would have to go back to 400.
350 to 449 -- 100 numbers
round 90 to the nearest ten
350 to 449
372 rounded to the nearest hundred is 400