All measurements and calculated results MUST be expressed in decimal form with a LIMITED number of sig figs.
There IS a difference...
Fractions do not provide information about the tool used or about which digit is the "guess".
NO FRACTIONS!!!!! (They do not show sig figs).
You get ONE guess digit
Repeat bars ignore errors in the data. They imply 'perfect' numbers, which is impossible with measured values.
NO REPEAT BARS!!!!! (We cannot predict past the guess digit).