The CAS Registry Mumber 106235-43-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,6,2,3 and 5 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 106235-43: (8*1)+(7*0)+(6*6)+(5*2)+(4*3)+(3*5)+(2*4)+(1*3)=92 92 % 10 = 2 So 106235-43-2 is a valid CAS Registry Number.