The CAS Registry Mumber 147425-92-1 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 2 respectively. Calculate Digit Verification of CAS Registry Number 147425-92: (8*1)+(7*4)+(6*7)+(5*4)+(4*2)+(3*5)+(2*9)+(1*2)=141 141 % 10 = 1 So 147425-92-1 is a valid CAS Registry Number.