A lab was performed which involved the measurement of the mass of varying amounts of pennies. This was to reinforce the use of the triple beam balance which was the previous lab. The mass of a roll of pennies was calculated, the roll containing 50 pennies. The mass was graphed against the number of pennies massed and a straight line resulted. The thickness of a penny, then 2 pennies, then 3,up to 10 pennies was measured, data recorded and a graph of the thickness in millimeters plotted against the number of pennies. The line formed was evaluated. The average mass of a penny was multiplied by 50 and compared with the mass of the 50. The average thickness was multiplied by 50 and compared to the total thickness of the roll. This lab increased the student's ability to properly use the balance, the measure in millimeters, to calculate averages, to properly construct and label a graph, and compare results.