When I use the PDCS, I enter the weights in Kilograms. Not pounds. If the gross weight is, for example, 115,400 pounds, then I would enter that value in Kilograms, which is equal to about 52,345 Kilos. The maximum weight of the 737-200 is 52,616 Kilos, so the Gross Weight will never exceed 100,000 and so you will never have to worry about entering that large a number next to GW.