The CAS Registry Mumber 33024-49-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,0,2 and 4 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 33024-49: (7*3)+(6*3)+(5*0)+(4*2)+(3*4)+(2*4)+(1*9)=76 76 % 10 = 6 So 33024-49-6 is a valid CAS Registry Number.