The CAS Registry Mumber 1026470-67-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,2,6,4,7 and 0 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1026470-67: (9*1)+(8*0)+(7*2)+(6*6)+(5*4)+(4*7)+(3*0)+(2*6)+(1*7)=126 126 % 10 = 6 So 1026470-67-6 is a valid CAS Registry Number.