The CAS Registry Mumber 92490-93-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,4,9 and 0 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 92490-93: (7*9)+(6*2)+(5*4)+(4*9)+(3*0)+(2*9)+(1*3)=152 152 % 10 = 2 So 92490-93-2 is a valid CAS Registry Number.