The CAS Registry Mumber 1401034-51-2 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,0,1,0,3 and 4 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1401034-51: (9*1)+(8*4)+(7*0)+(6*1)+(5*0)+(4*3)+(3*4)+(2*5)+(1*1)=82 82 % 10 = 2 So 1401034-51-2 is a valid CAS Registry Number.