The CAS Registry Mumber 10430-47-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,4,3 and 0 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 10430-47: (7*1)+(6*0)+(5*4)+(4*3)+(3*0)+(2*4)+(1*7)=54 54 % 10 = 4 So 10430-47-4 is a valid CAS Registry Number.