The CAS Registry Mumber 169830-46-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,9,8,3 and 0 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 169830-46: (8*1)+(7*6)+(6*9)+(5*8)+(4*3)+(3*0)+(2*4)+(1*6)=170 170 % 10 = 0 So 169830-46-0 is a valid CAS Registry Number.