When rounding to the nearest tenth you need to look at the ones place and see if the number is 4 or below. If it is then the number will be lower and it will have a zero but if it is 5 or above then the number will be higher. For example, 17, the ones place is bigger than 5 so 17 rounded to the nearest 10th is 20. Same thing with the number 27. The 7 is bigger than 5 so 27 rounded to the nearest 10th is 30.
