The CAS Registry Mumber 126479-67-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,6,4,7 and 9 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 126479-67: (8*1)+(7*2)+(6*6)+(5*4)+(4*7)+(3*9)+(2*6)+(1*7)=152 152 % 10 = 2 So 126479-67-2 is a valid CAS Registry Number.