The CAS Registry Mumber 140148-02-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,0,1,4 and 8 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 140148-02: (8*1)+(7*4)+(6*0)+(5*1)+(4*4)+(3*8)+(2*0)+(1*2)=83 83 % 10 = 3 So 140148-02-3 is a valid CAS Registry Number.