The CAS Registry Mumber 102483-16-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,4,8 and 3 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 102483-16: (8*1)+(7*0)+(6*2)+(5*4)+(4*8)+(3*3)+(2*1)+(1*6)=89 89 % 10 = 9 So 102483-16-9 is a valid CAS Registry Number.