Since the tenths in that number is 3 and the number after that is number greater or equal to 5, therefore, you need to add 1 to the number in the tenth place, which makes it 4.
To round 27.35 to the nearest tenth consider the hundredths’ value of 27.35, which is 5 and equal or more than 5. Therefore, the tenths value of 27.35 increases by 1 to 4.
