The CAS Registry Mumber 78114-47-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,1,1 and 4 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 78114-47: (7*7)+(6*8)+(5*1)+(4*1)+(3*4)+(2*4)+(1*7)=133 133 % 10 = 3 So 78114-47-3 is a valid CAS Registry Number.