The CAS Registry Mumber 90934-29-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,9,3 and 4 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 90934-29: (7*9)+(6*0)+(5*9)+(4*3)+(3*4)+(2*2)+(1*9)=145 145 % 10 = 5 So 90934-29-5 is a valid CAS Registry Number.