The CAS Registry Mumber 6232-84-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,2,3 and 2 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 6232-84: (6*6)+(5*2)+(4*3)+(3*2)+(2*8)+(1*4)=84 84 % 10 = 4 So 6232-84-4 is a valid CAS Registry Number.