The CAS Registry Mumber 14606-40-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,4,6,0 and 6 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 14606-40: (7*1)+(6*4)+(5*6)+(4*0)+(3*6)+(2*4)+(1*0)=87 87 % 10 = 7 So 14606-40-7 is a valid CAS Registry Number.