The CAS Registry Mumber 57614-97-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,6,1 and 4 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 57614-97: (7*5)+(6*7)+(5*6)+(4*1)+(3*4)+(2*9)+(1*7)=148 148 % 10 = 8 So 57614-97-8 is a valid CAS Registry Number.