The CAS Registry Mumber 124462-93-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,4,4,6 and 2 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 124462-93: (8*1)+(7*2)+(6*4)+(5*4)+(4*6)+(3*2)+(2*9)+(1*3)=117 117 % 10 = 7 So 124462-93-7 is a valid CAS Registry Number.