The CAS Registry Mumber 12714-78-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,7,1 and 4 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 12714-78: (7*1)+(6*2)+(5*7)+(4*1)+(3*4)+(2*7)+(1*8)=92 92 % 10 = 2 So 12714-78-2 is a valid CAS Registry Number.