The CAS Registry Mumber 60188-14-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,1,8 and 8 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 60188-14: (7*6)+(6*0)+(5*1)+(4*8)+(3*8)+(2*1)+(1*4)=109 109 % 10 = 9 So 60188-14-9 is a valid CAS Registry Number.