The CAS Registry Mumber 30062-39-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,0,6 and 2 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 30062-39: (7*3)+(6*0)+(5*0)+(4*6)+(3*2)+(2*3)+(1*9)=66 66 % 10 = 6 So 30062-39-6 is a valid CAS Registry Number.