The CAS Registry Mumber 569-04-0 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,6 and 9 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 569-04: (5*5)+(4*6)+(3*9)+(2*0)+(1*4)=80 80 % 10 = 0 So 569-04-0 is a valid CAS Registry Number.