The CAS Registry Mumber 37187-67-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,1,8 and 7 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 37187-67: (7*3)+(6*7)+(5*1)+(4*8)+(3*7)+(2*6)+(1*7)=140 140 % 10 = 0 So 37187-67-0 is a valid CAS Registry Number.