638 is less than half way between 600 and 700 so, it would round to 600.
600
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.
200
96 round to the nearest ten=100
600
The number 638 is nearest to the hundred 600. When rounding to the nearest hundred, you look at the tens digit (which is 3 in this case). Since 3 is less than 5, you round down to 600.
372 rounded to the nearest hundred is 400
300
640
100
4198 to the nearest 100 = 4200
10100
The answer is zero.
95,96,97,98,99 round them up to the ten, all 100 to the 100, all 100.
100.
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.