The CAS Registry Mumber 94287-18-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,2,8 and 7 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 94287-18: (7*9)+(6*4)+(5*2)+(4*8)+(3*7)+(2*1)+(1*8)=160 160 % 10 = 0 So 94287-18-0 is a valid CAS Registry Number.