The CAS Registry Mumber 79233-46-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,2,3 and 3 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 79233-46: (7*7)+(6*9)+(5*2)+(4*3)+(3*3)+(2*4)+(1*6)=148 148 % 10 = 8 So 79233-46-8 is a valid CAS Registry Number.