The CAS Registry Mumber 94124-43-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,1,2 and 4 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 94124-43: (7*9)+(6*4)+(5*1)+(4*2)+(3*4)+(2*4)+(1*3)=123 123 % 10 = 3 So 94124-43-3 is a valid CAS Registry Number.