The CAS Registry Mumber 292613-90-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,9,2,6,1 and 3 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 292613-90: (8*2)+(7*9)+(6*2)+(5*6)+(4*1)+(3*3)+(2*9)+(1*0)=152 152 % 10 = 2 So 292613-90-2 is a valid CAS Registry Number.