The CAS Registry Mumber 112348-30-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,3,4 and 8 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 112348-30: (8*1)+(7*1)+(6*2)+(5*3)+(4*4)+(3*8)+(2*3)+(1*0)=88 88 % 10 = 8 So 112348-30-8 is a valid CAS Registry Number.