The CAS Registry Mumber 38452-94-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,8,4,5 and 2 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 38452-94: (7*3)+(6*8)+(5*4)+(4*5)+(3*2)+(2*9)+(1*4)=137 137 % 10 = 7 So 38452-94-7 is a valid CAS Registry Number.