The CAS Registry Mumber 924-29-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 9,2 and 4 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 924-29: (5*9)+(4*2)+(3*4)+(2*2)+(1*9)=78 78 % 10 = 8 So 924-29-8 is a valid CAS Registry Number.