Salutations!
To round numbers, you need to know whether the number next to the place is greater than 5 or lesser than 5. If its greater than 5, you need to round up. If its lesser than 5, you need to round down.
a) the nearest one = 98
b) the nearest tenth = 97.6
c) the nearest hundredth = 97.64.
Hope I helped (:
Have a great day!