The CAS Registry Mumber 120103-44-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,1,0 and 3 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 120103-44: (8*1)+(7*2)+(6*0)+(5*1)+(4*0)+(3*3)+(2*4)+(1*4)=48 48 % 10 = 8 So 120103-44-8 is a valid CAS Registry Number.