The CAS Registry Mumber 30332-44-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,3,3 and 2 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 30332-44: (7*3)+(6*0)+(5*3)+(4*3)+(3*2)+(2*4)+(1*4)=66 66 % 10 = 6 So 30332-44-6 is a valid CAS Registry Number.