The CAS Registry Mumber 117869-46-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,8,6 and 9 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 117869-46: (8*1)+(7*1)+(6*7)+(5*8)+(4*6)+(3*9)+(2*4)+(1*6)=162 162 % 10 = 2 So 117869-46-2 is a valid CAS Registry Number.