The CAS Registry Mumber 351425-04-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,5,1,4,2 and 5 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 351425-04: (8*3)+(7*5)+(6*1)+(5*4)+(4*2)+(3*5)+(2*0)+(1*4)=112 112 % 10 = 2 So 351425-04-2 is a valid CAS Registry Number.