The CAS Registry Mumber 4300-95-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,3,0 and 0 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 4300-95: (6*4)+(5*3)+(4*0)+(3*0)+(2*9)+(1*5)=62 62 % 10 = 2 So 4300-95-2 is a valid CAS Registry Number.