The CAS Registry Mumber 46946-53-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,6,9,4 and 6 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 46946-53: (7*4)+(6*6)+(5*9)+(4*4)+(3*6)+(2*5)+(1*3)=156 156 % 10 = 6 So 46946-53-6 is a valid CAS Registry Number.