The CAS Registry Mumber 139706-46-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,7,0 and 6 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 139706-46: (8*1)+(7*3)+(6*9)+(5*7)+(4*0)+(3*6)+(2*4)+(1*6)=150 150 % 10 = 0 So 139706-46-0 is a valid CAS Registry Number.