The CAS Registry Mumber 40062-04-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,0,6 and 2 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 40062-04: (7*4)+(6*0)+(5*0)+(4*6)+(3*2)+(2*0)+(1*4)=62 62 % 10 = 2 So 40062-04-2 is a valid CAS Registry Number.