The CAS Registry Mumber 85830-29-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,8,3 and 0 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 85830-29: (7*8)+(6*5)+(5*8)+(4*3)+(3*0)+(2*2)+(1*9)=151 151 % 10 = 1 So 85830-29-1 is a valid CAS Registry Number.