The CAS Registry Mumber 83852-00-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,8,5 and 2 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 83852-00: (7*8)+(6*3)+(5*8)+(4*5)+(3*2)+(2*0)+(1*0)=140 140 % 10 = 0 So 83852-00-0 is a valid CAS Registry Number.