2539, 2541 and 2542 rounded to the nearest ten will round to 2540.
0
2500
3000
2540
round 90 to the nearest ten
372 rounded to the nearest hundred is 400
300
To round 97 to the nearest 100, you need to look at the digit in the tens place, which is 9 in this case. Since 9 is greater than or equal to 5, you will round up. Therefore, 97 rounded to the nearest 100 is 100.
100
100
10100