The CAS Registry Mumber 14637-88-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,4,6,3 and 7 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 14637-88: (7*1)+(6*4)+(5*6)+(4*3)+(3*7)+(2*8)+(1*8)=118 118 % 10 = 8 So 14637-88-8 is a valid CAS Registry Number.