The CAS Registry Mumber 30346-02-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,3,4 and 6 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 30346-02: (7*3)+(6*0)+(5*3)+(4*4)+(3*6)+(2*0)+(1*2)=72 72 % 10 = 2 So 30346-02-2 is a valid CAS Registry Number.