The CAS Registry Mumber 114988-06-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,9,8 and 8 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 114988-06: (8*1)+(7*1)+(6*4)+(5*9)+(4*8)+(3*8)+(2*0)+(1*6)=146 146 % 10 = 6 So 114988-06-6 is a valid CAS Registry Number.