The CAS Registry Mumber 96336-25-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,3,3 and 6 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 96336-25: (7*9)+(6*6)+(5*3)+(4*3)+(3*6)+(2*2)+(1*5)=153 153 % 10 = 3 So 96336-25-3 is a valid CAS Registry Number.