The CAS Registry Mumber 3062-06-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,0,6 and 2 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 3062-06: (6*3)+(5*0)+(4*6)+(3*2)+(2*0)+(1*6)=54 54 % 10 = 4 So 3062-06-4 is a valid CAS Registry Number.