The CAS Registry Mumber 1071207-69-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,7,1,2,0 and 7 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 1071207-69: (9*1)+(8*0)+(7*7)+(6*1)+(5*2)+(4*0)+(3*7)+(2*6)+(1*9)=116 116 % 10 = 6 So 1071207-69-6 is a valid CAS Registry Number.