The CAS Registry Mumber 30382-45-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,3,8 and 2 respectively; the second part has 2 digits, 4 and 5 respectively. Calculate Digit Verification of CAS Registry Number 30382-45: (7*3)+(6*0)+(5*3)+(4*8)+(3*2)+(2*4)+(1*5)=87 87 % 10 = 7 So 30382-45-7 is a valid CAS Registry Number.