638 is less than half way between 600 and 700 so, it would round to 600.
Uff
600
Yeah
600
600
640
600
round 90 to the nearest ten
372 rounded to the nearest hundred is 400
300
100
100
100
2,222 rounded to the nearest 100 is 2,200.
10100
100
4198 to the nearest 100 = 4200
127 rounded to the nearest hundred is 100. Rounded to the nearest 10 is 130.