The CAS Registry Mumber 137255-96-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,2,5 and 5 respectively; the second part has 2 digits, 9 and 6 respectively. Calculate Digit Verification of CAS Registry Number 137255-96: (8*1)+(7*3)+(6*7)+(5*2)+(4*5)+(3*5)+(2*9)+(1*6)=140 140 % 10 = 0 So 137255-96-0 is a valid CAS Registry Number.