To round to the nearest tenth of a number, you must determine if the current tenth or the next tenth is closest (less than 5 hundredths).
An example:
4.3946
Here, the three is the tenths place and the 9 is the hundredths place. The number is about nine hundredths away from being 4.3, but it is less than one hundredth away from being 4.4, so rounding to the nearest hundredth means rounding up to 4.4 in this case.
There is only one exception to that case, and that is if the hundredths place is a five. It is standard convention to round up in this case, always.
A question might say "Find 3.17 to the nearest tenths." In such a quesiton, first you have to identify the tenths place. The tenths place is the place right after the decimal place-directly to the right. In our example, the tenths place is the 1. To round to the nearest tenth, look at the digit to the right (this is your hundredths place). If the number is larger than 4, round up. If not, don't round-therefore, 0,1,2,3, and 4 don't round, while 5,6,7,8, and 9 do.
3.17-to round, just add a digit to the place you are rounding. Since 7 is larger than 4, add one to the tenths place-therefore, your answer is 3.2
If your number was 3.13, then you DON'T round. This means you leave the number the same. Hence, your answer is 3.1
It is then 19.1 to the nearest tenths
It is 17.9 to the nearest tenths
8.96 to the nearest tenths is 9.0
2.45 to the nearest tenths is 2.5
7.66 to the nearest tenths is 7.7
67.07 to the nearest tenths is 67.1
It is already rounded to the nearest tenths.
116 to the nearest tenths is 116.0
9,735,519 to the nearest tenths is 9,735,519.0
52 to the nearest tenths is 52.0
298.3060 to the nearest tenths is 298.3
17.56 to the nearest tenths is 17.6