The CAS Registry Mumber 60419-87-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,4,1 and 9 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 60419-87: (7*6)+(6*0)+(5*4)+(4*1)+(3*9)+(2*8)+(1*7)=116 116 % 10 = 6 So 60419-87-6 is a valid CAS Registry Number.