The CAS Registry Mumber 130458-00-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,0,4,5 and 8 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 130458-00: (8*1)+(7*3)+(6*0)+(5*4)+(4*5)+(3*8)+(2*0)+(1*0)=93 93 % 10 = 3 So 130458-00-3 is a valid CAS Registry Number.