The CAS Registry Mumber 1031929-10-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,3,1,9,2 and 9 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1031929-10: (9*1)+(8*0)+(7*3)+(6*1)+(5*9)+(4*2)+(3*9)+(2*1)+(1*0)=118 118 % 10 = 8 So 1031929-10-8 is a valid CAS Registry Number.