The CAS Registry Mumber 67019-65-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,0,1 and 9 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 67019-65: (7*6)+(6*7)+(5*0)+(4*1)+(3*9)+(2*6)+(1*5)=132 132 % 10 = 2 So 67019-65-2 is a valid CAS Registry Number.