The CAS Registry Mumber 16307-29-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,6,3,0 and 7 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 16307-29: (7*1)+(6*6)+(5*3)+(4*0)+(3*7)+(2*2)+(1*9)=92 92 % 10 = 2 So 16307-29-2 is a valid CAS Registry Number.