The CAS Registry Mumber 12627-00-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,6,2 and 7 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 12627-00: (7*1)+(6*2)+(5*6)+(4*2)+(3*7)+(2*0)+(1*0)=78 78 % 10 = 8 So 12627-00-8 is a valid CAS Registry Number.