The CAS Registry Mumber 106492-15-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,6,4,9 and 2 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 106492-15: (8*1)+(7*0)+(6*6)+(5*4)+(4*9)+(3*2)+(2*1)+(1*5)=113 113 % 10 = 3 So 106492-15-3 is a valid CAS Registry Number.