The CAS Registry Mumber 53213-46-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,2,1 and 3 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 53213-46: (7*5)+(6*3)+(5*2)+(4*1)+(3*3)+(2*4)+(1*6)=90 90 % 10 = 0 So 53213-46-0 is a valid CAS Registry Number.