The CAS Registry Mumber 8029-34-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 8,0,2 and 9 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 8029-34: (6*8)+(5*0)+(4*2)+(3*9)+(2*3)+(1*4)=93 93 % 10 = 3 So 8029-34-3 is a valid CAS Registry Number.