The CAS Registry Mumber 94319-54-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,3,1 and 9 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 94319-54: (7*9)+(6*4)+(5*3)+(4*1)+(3*9)+(2*5)+(1*4)=147 147 % 10 = 7 So 94319-54-7 is a valid CAS Registry Number.