The CAS Registry Mumber 90282-46-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,2,8 and 2 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 90282-46: (7*9)+(6*0)+(5*2)+(4*8)+(3*2)+(2*4)+(1*6)=125 125 % 10 = 5 So 90282-46-5 is a valid CAS Registry Number.