The CAS Registry Mumber 23862-68-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,8,6 and 2 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 23862-68: (7*2)+(6*3)+(5*8)+(4*6)+(3*2)+(2*6)+(1*8)=122 122 % 10 = 2 So 23862-68-2 is a valid CAS Registry Number.