The CAS Registry Mumber 94018-10-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,0,1 and 8 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 94018-10: (7*9)+(6*4)+(5*0)+(4*1)+(3*8)+(2*1)+(1*0)=117 117 % 10 = 7 So 94018-10-7 is a valid CAS Registry Number.