The CAS Registry Mumber 122348-09-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,3,4 and 8 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 122348-09: (8*1)+(7*2)+(6*2)+(5*3)+(4*4)+(3*8)+(2*0)+(1*9)=98 98 % 10 = 8 So 122348-09-8 is a valid CAS Registry Number.