The CAS Registry Mumber 10-46-8 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 1 and 0 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 10-46: (4*1)+(3*0)+(2*4)+(1*6)=18 18 % 10 = 8 So 10-46-8 is a valid CAS Registry Number.