The CAS Registry Mumber 30074-09-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,0,7 and 4 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 30074-09: (7*3)+(6*0)+(5*0)+(4*7)+(3*4)+(2*0)+(1*9)=70 70 % 10 = 0 So 30074-09-0 is a valid CAS Registry Number.