This would take up one of the work areas on the CUE sheet, see example below. Once the uncertainty of the sample mass is determined, the volume is determined by dividing mass by density. Now, the uncertainty in the result is calculated by following the procedure for propagating errors with multiplication or division1. Another CUE sheet work area would contain this calculation, see the example. In the case where only two quantities are combined, one of the columns will be left blank.
Space is left on the right hand of the sheet for making notes, comments, or working out units.
It will make the evaluation of the process easier for the instructor. It forces you to consider the absolute and relative uncertainty of each quantity and result. You can easily scan a completed CUE sheet to see where the largest absolute and relative error enter into and propagate through the calculation. This will be very helpful in summarizing how experimental uncertainty affects your results. After doing several of these sheets, you will begin to see how certain steps can be omitted and still yield an accurate estimate of propagated error.