How do you round a decimal to the nearest tenths?

Answer 1

When rounding to a specific place, take a look at the digit immediately to the right of the target, in this case, the hundredths place. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.

Answer 2

There are several conventions used for rounding; probably the simplest one, which is very commonly used, is to discard all the digits you DON'T want (in this ase, starting with the second decimal digit). Then, if the FIRST digit discarded is 5 or more, add one to the remaining digits. Thus:

0.6411 would be rounded to 0.6 (discard all digits, starting with the second digit)

3.2718 would be rounded to 3.3 (same as above, but since the first digit discarded is greater or equal to 5, add one (in the position of the last remaining digit) to the result. In this case, 3.2 + 0.1 = 3.3.