In the first column, 20.53 kilometer is most precise
In second column the scale that measures 1/10 of a kg is most precise.
In third column, 3.72 millimeters is precise.
For 20.53 kilometer, there are two digits after the decimal point. So, the measurement measures even the slightest change in decimals of the measurement.
1/10 of a kg can be written as 0.1 kg. So, in this scale the weight is measured upto the smallest change of one decimal point. For the scale that measures the nearest kg, the small change is not measured as there are no digits after decimal in the measurement. For example, compare the weights 500 kg and 500.5 kg . 500.5 kg is measured in 1/10 of a kg scale. The extra 0.5 kg s measure is shown. So, it will be a more precise value.
In 3.72 millimeters, there are two digits after the decimal point. So, when a measurement is taken, we get a precision upto two decimal places, while for 3.7mm, the measurement can be taken only upto one decimal place and for 3 mm no decimal points are there.