The CAS Registry Mumber 63791-08-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,7,9 and 1 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 63791-08: (7*6)+(6*3)+(5*7)+(4*9)+(3*1)+(2*0)+(1*8)=142 142 % 10 = 2 So 63791-08-2 is a valid CAS Registry Number.