The CAS Registry Mumber 10037-03-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,0,0,3 and 7 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 10037-03: (7*1)+(6*0)+(5*0)+(4*3)+(3*7)+(2*0)+(1*3)=43 43 % 10 = 3 So 10037-03-3 is a valid CAS Registry Number.