The CAS Registry Mumber 102713-08-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,7,1 and 3 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 102713-08: (8*1)+(7*0)+(6*2)+(5*7)+(4*1)+(3*3)+(2*0)+(1*8)=76 76 % 10 = 6 So 102713-08-6 is a valid CAS Registry Number.