The CAS Registry Mumber 118894-22-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,8,9 and 4 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 118894-22: (8*1)+(7*1)+(6*8)+(5*8)+(4*9)+(3*4)+(2*2)+(1*2)=157 157 % 10 = 7 So 118894-22-7 is a valid CAS Registry Number.