588 Rounded to the Nearest 100-
600
588 Rounded to the Nearest 10-
590
Explanation-
To round it to the Nearest hundred you look at the ten's place and if the ten's place is higher than 5 or is 5 then your hundreds number will go up. If in is lower than 5 your number for the hundreds place will stay the same while the ten's place goes down to 0 or stays the same (forgot). Same with rounding with nearest ten but going one down.