The CAS Registry Mumber 6225-95-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,2,2 and 5 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 6225-95: (6*6)+(5*2)+(4*2)+(3*5)+(2*9)+(1*5)=92 92 % 10 = 2 So 6225-95-2 is a valid CAS Registry Number.