The CAS Registry Mumber 115848-04-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,8,4 and 8 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 115848-04: (8*1)+(7*1)+(6*5)+(5*8)+(4*4)+(3*8)+(2*0)+(1*4)=129 129 % 10 = 9 So 115848-04-9 is a valid CAS Registry Number.