The CAS Registry Mumber 194367-70-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,4,3,6 and 7 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 194367-70: (8*1)+(7*9)+(6*4)+(5*3)+(4*6)+(3*7)+(2*7)+(1*0)=169 169 % 10 = 9 So 194367-70-9 is a valid CAS Registry Number.