The CAS Registry Mumber 130832-62-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,0,8,3 and 2 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 130832-62: (8*1)+(7*3)+(6*0)+(5*8)+(4*3)+(3*2)+(2*6)+(1*2)=101 101 % 10 = 1 So 130832-62-1 is a valid CAS Registry Number.