The CAS Registry Mumber 126706-69-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,6,7,0 and 6 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 126706-69: (8*1)+(7*2)+(6*6)+(5*7)+(4*0)+(3*6)+(2*6)+(1*9)=132 132 % 10 = 2 So 126706-69-2 is a valid CAS Registry Number.