The CAS Registry Mumber 93298-27-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,2,9 and 8 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 93298-27: (7*9)+(6*3)+(5*2)+(4*9)+(3*8)+(2*2)+(1*7)=162 162 % 10 = 2 So 93298-27-2 is a valid CAS Registry Number.