The CAS Registry Mumber 10437-36-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,4,3 and 7 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 10437-36: (7*1)+(6*0)+(5*4)+(4*3)+(3*7)+(2*3)+(1*6)=72 72 % 10 = 2 So 10437-36-2 is a valid CAS Registry Number.