The CAS Registry Mumber 29213-07-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,2,1 and 3 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 29213-07: (7*2)+(6*9)+(5*2)+(4*1)+(3*3)+(2*0)+(1*7)=98 98 % 10 = 8 So 29213-07-8 is a valid CAS Registry Number.