Not sure why this does not work

[Spartan27215]

Individually

({<RptSetName={'$(PreviousPeriod)', '$(CurrentPeriod)'}, RelCode={'E'}, Screened={1}>} PMPM_MedTotalPaid)   = $358

({<RptSetName={'$(PreviousPeriod)', '$(CurrentPeriod)'}, RelCode={'E'}>} PMPM_MedTotalPaid) = $451

When I try to divide the 2, I get Zero and don't know why?

({<RptSetName={'$(PreviousPeriod)', '$(CurrentPeriod)'}, RelCode={'E'}, Screened={1}>} PMPM_MedTotalPaid)  / 

({<RptSetName={'$(PreviousPeriod)', '$(CurrentPeriod)'}, RelCode={'E'}>} PMPM_MedTotalPaid)  = 0 Should be 79%