The CAS Registry Mumber 93948-24-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,9,4 and 8 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 93948-24: (7*9)+(6*3)+(5*9)+(4*4)+(3*8)+(2*2)+(1*4)=174 174 % 10 = 4 So 93948-24-4 is a valid CAS Registry Number.