The CAS Registry Mumber 33147-75-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,1,4 and 7 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 33147-75: (7*3)+(6*3)+(5*1)+(4*4)+(3*7)+(2*7)+(1*5)=100 100 % 10 = 0 So 33147-75-0 is a valid CAS Registry Number.