The CAS Registry Mumber 94272-47-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,2,7 and 2 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 94272-47: (7*9)+(6*4)+(5*2)+(4*7)+(3*2)+(2*4)+(1*7)=146 146 % 10 = 6 So 94272-47-6 is a valid CAS Registry Number.