The CAS Registry Mumber 29367-16-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,9,3,6 and 7 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 29367-16: (7*2)+(6*9)+(5*3)+(4*6)+(3*7)+(2*1)+(1*6)=136 136 % 10 = 6 So 29367-16-6 is a valid CAS Registry Number.