The CAS Registry Mumber 132934-82-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,9,3 and 4 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 132934-82: (8*1)+(7*3)+(6*2)+(5*9)+(4*3)+(3*4)+(2*8)+(1*2)=128 128 % 10 = 8 So 132934-82-8 is a valid CAS Registry Number.