Take a time measurement. Obtain a time measurement by using a stop watch or chronograph to take a measurement. Otherwise, you can use an existing measurement.
Formulate your measurement in minutes. This will help facilitate the use of a table to determine the conversion of time into tenths.
Consult a conversion table to obtain a time reading in tenths. The conversion table is based on on converting minutes to a decimal. The table rounds up to give the user tenths. A sample of the standard table looks like this:
1-6 minutes =0 to .1
9-14 minutes = .2
15-20 minutes = .3
21-26 minutes = .4
27-32 minutes = .5
33-38 minutes = .6