The CAS Registry Mumber 17483-47-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,7,4,8 and 3 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 17483-47: (7*1)+(6*7)+(5*4)+(4*8)+(3*3)+(2*4)+(1*7)=125 125 % 10 = 5 So 17483-47-5 is a valid CAS Registry Number.