The CAS Registry Mumber 106235-49-8 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 9 respectively. Calculate Digit Verification of CAS Registry Number 106235-49: (8*1)+(7*0)+(6*6)+(5*2)+(4*3)+(3*5)+(2*4)+(1*9)=98 98 % 10 = 8 So 106235-49-8 is a valid CAS Registry Number.