The CAS Registry Mumber 84669-93-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,6,6 and 9 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 84669-93: (7*8)+(6*4)+(5*6)+(4*6)+(3*9)+(2*9)+(1*3)=182 182 % 10 = 2 So 84669-93-2 is a valid CAS Registry Number.