The CAS Registry Mumber 141100-39-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,1,1,0 and 0 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 141100-39: (8*1)+(7*4)+(6*1)+(5*1)+(4*0)+(3*0)+(2*3)+(1*9)=62 62 % 10 = 2 So 141100-39-2 is a valid CAS Registry Number.