The CAS Registry Mumber 142592-13-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,5,9 and 2 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 142592-13: (8*1)+(7*4)+(6*2)+(5*5)+(4*9)+(3*2)+(2*1)+(1*3)=120 120 % 10 = 0 So 142592-13-0 is a valid CAS Registry Number.