The CAS Registry Mumber 36228-29-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,6,2,2 and 8 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 36228-29: (7*3)+(6*6)+(5*2)+(4*2)+(3*8)+(2*2)+(1*9)=112 112 % 10 = 2 So 36228-29-2 is a valid CAS Registry Number.