The CAS Registry Mumber 90245-46-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,2,4 and 5 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 90245-46: (7*9)+(6*0)+(5*2)+(4*4)+(3*5)+(2*4)+(1*6)=118 118 % 10 = 8 So 90245-46-8 is a valid CAS Registry Number.