The CAS Registry Mumber 124764-14-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,4,7,6 and 4 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 124764-14: (8*1)+(7*2)+(6*4)+(5*7)+(4*6)+(3*4)+(2*1)+(1*4)=123 123 % 10 = 3 So 124764-14-3 is a valid CAS Registry Number.