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39.05 and you want to round it to the nearest TENTH, then you write a 5 under the HUNDREDTH position. Then you write zeros under all the other digits to the left and also preserve the decimal point as shown below.

39.05

00.05

Add the two numbers to get 39.10 and truncate the number after the tenth's position to get 39.1 which is the answer. If the original number was 39.01 then you will have

39.01

00.05

and when added will give 39.06 and after truncation will give you 39.0

If the original number was 39.09 then you will have

39.09

00.05

and when added will give 39.14 and after truncation will give you 39.1

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