The CAS Registry Mumber 140676-23-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,0,6,7 and 6 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 140676-23: (8*1)+(7*4)+(6*0)+(5*6)+(4*7)+(3*6)+(2*2)+(1*3)=119 119 % 10 = 9 So 140676-23-9 is a valid CAS Registry Number.