The CAS Registry Mumber 96102-12-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,1,0 and 2 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 96102-12: (7*9)+(6*6)+(5*1)+(4*0)+(3*2)+(2*1)+(1*2)=114 114 % 10 = 4 So 96102-12-4 is a valid CAS Registry Number.