The CAS Registry Mumber 132298-10-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,2,9 and 8 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 132298-10: (8*1)+(7*3)+(6*2)+(5*2)+(4*9)+(3*8)+(2*1)+(1*0)=113 113 % 10 = 3 So 132298-10-3 is a valid CAS Registry Number.