What are the net and gross yields of ATP in glycolysis?

Gross yield of ATP during glycolysis: 4

Net yield of ATP during glycolysis: 2 (anaerobic glycolysis of a glucose molecule took 2 ATP to accomplish so subtract 2 ATP from your gross yield of 4...therefore it's 2 for net yield).

Kreb cycle: produces a total of 2ATP (one each time it happens and it happens twice).