The CAS Registry Mumber 45012-62-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,5,0,1 and 2 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 45012-62: (7*4)+(6*5)+(5*0)+(4*1)+(3*2)+(2*6)+(1*2)=82 82 % 10 = 2 So 45012-62-2 is a valid CAS Registry Number.