The CAS Registry Mumber 130890-46-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,0,8,9 and 0 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 130890-46: (8*1)+(7*3)+(6*0)+(5*8)+(4*9)+(3*0)+(2*4)+(1*6)=119 119 % 10 = 9 So 130890-46-9 is a valid CAS Registry Number.