The CAS Registry Mumber 9063-39-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,6 and 3 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 9063-39: (6*9)+(5*0)+(4*6)+(3*3)+(2*3)+(1*9)=102 102 % 10 = 2 So 9063-39-2 is a valid CAS Registry Number.