The CAS Registry Mumber 30462-48-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,4,6 and 2 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 30462-48: (7*3)+(6*0)+(5*4)+(4*6)+(3*2)+(2*4)+(1*8)=87 87 % 10 = 7 So 30462-48-7 is a valid CAS Registry Number.