The CAS Registry Mumber 124175-62-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,4,1,7 and 5 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 124175-62: (8*1)+(7*2)+(6*4)+(5*1)+(4*7)+(3*5)+(2*6)+(1*2)=108 108 % 10 = 8 So 124175-62-8 is a valid CAS Registry Number.