The CAS Registry Mumber 1148-43-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,1,4 and 8 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1148-43: (6*1)+(5*1)+(4*4)+(3*8)+(2*4)+(1*3)=62 62 % 10 = 2 So 1148-43-2 is a valid CAS Registry Number.