The CAS Registry Mumber 127932-37-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,7,9,3 and 2 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 127932-37: (8*1)+(7*2)+(6*7)+(5*9)+(4*3)+(3*2)+(2*3)+(1*7)=140 140 % 10 = 0 So 127932-37-0 is a valid CAS Registry Number.