The CAS Registry Mumber 185230-92-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,2,3 and 0 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 185230-92: (8*1)+(7*8)+(6*5)+(5*2)+(4*3)+(3*0)+(2*9)+(1*2)=136 136 % 10 = 6 So 185230-92-6 is a valid CAS Registry Number.