The CAS Registry Mumber 133147-04-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,1,4 and 7 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 133147-04: (8*1)+(7*3)+(6*3)+(5*1)+(4*4)+(3*7)+(2*0)+(1*4)=93 93 % 10 = 3 So 133147-04-3 is a valid CAS Registry Number.