The CAS Registry Mumber 102263-47-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,2,6 and 3 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 102263-47: (8*1)+(7*0)+(6*2)+(5*2)+(4*6)+(3*3)+(2*4)+(1*7)=78 78 % 10 = 8 So 102263-47-8 is a valid CAS Registry Number.