The CAS Registry Mumber 119448-98-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,4,4 and 8 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 119448-98: (8*1)+(7*1)+(6*9)+(5*4)+(4*4)+(3*8)+(2*9)+(1*8)=155 155 % 10 = 5 So 119448-98-5 is a valid CAS Registry Number.