The CAS Registry Mumber 934660-14-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,3,4,6,6 and 0 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 934660-14: (8*9)+(7*3)+(6*4)+(5*6)+(4*6)+(3*0)+(2*1)+(1*4)=177 177 % 10 = 7 So 934660-14-7 is a valid CAS Registry Number.