The CAS Registry Mumber 78114-48-4 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 8 respectively. Calculate Digit Verification of CAS Registry Number 78114-48: (7*7)+(6*8)+(5*1)+(4*1)+(3*4)+(2*4)+(1*8)=134 134 % 10 = 4 So 78114-48-4 is a valid CAS Registry Number.