The CAS Registry Mumber 88458-46-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,8,4,5 and 8 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 88458-46: (7*8)+(6*8)+(5*4)+(4*5)+(3*8)+(2*4)+(1*6)=182 182 % 10 = 2 So 88458-46-2 is a valid CAS Registry Number.