The CAS Registry Mumber 14015-61-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,4,0,1 and 5 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 14015-61: (7*1)+(6*4)+(5*0)+(4*1)+(3*5)+(2*6)+(1*1)=63 63 % 10 = 3 So 14015-61-3 is a valid CAS Registry Number.