The CAS Registry Mumber 69274-24-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,2,7 and 4 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 69274-24: (7*6)+(6*9)+(5*2)+(4*7)+(3*4)+(2*2)+(1*4)=154 154 % 10 = 4 So 69274-24-4 is a valid CAS Registry Number.