The CAS Registry Mumber 99325-02-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,3,2 and 5 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 99325-02: (7*9)+(6*9)+(5*3)+(4*2)+(3*5)+(2*0)+(1*2)=157 157 % 10 = 7 So 99325-02-7 is a valid CAS Registry Number.