The CAS Registry Mumber 3395-06-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,3,9 and 5 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 3395-06: (6*3)+(5*3)+(4*9)+(3*5)+(2*0)+(1*6)=90 90 % 10 = 0 So 3395-06-0 is a valid CAS Registry Number.