The CAS Registry Mumber 147425-94-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,7,4,2 and 5 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 147425-94: (8*1)+(7*4)+(6*7)+(5*4)+(4*2)+(3*5)+(2*9)+(1*4)=143 143 % 10 = 3 So 147425-94-3 is a valid CAS Registry Number.