The CAS Registry Mumber 84029-13-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,0,2 and 9 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 84029-13: (7*8)+(6*4)+(5*0)+(4*2)+(3*9)+(2*1)+(1*3)=120 120 % 10 = 0 So 84029-13-0 is a valid CAS Registry Number.