The CAS Registry Mumber 106914-81-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,6,9,1 and 4 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 106914-81: (8*1)+(7*0)+(6*6)+(5*9)+(4*1)+(3*4)+(2*8)+(1*1)=122 122 % 10 = 2 So 106914-81-2 is a valid CAS Registry Number.