The CAS Registry Mumber 29673-97-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,6,7 and 3 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 29673-97: (7*2)+(6*9)+(5*6)+(4*7)+(3*3)+(2*9)+(1*7)=160 160 % 10 = 0 So 29673-97-0 is a valid CAS Registry Number.