The CAS Registry Mumber 60419-88-7 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 8 respectively. Calculate Digit Verification of CAS Registry Number 60419-88: (7*6)+(6*0)+(5*4)+(4*1)+(3*9)+(2*8)+(1*8)=117 117 % 10 = 7 So 60419-88-7 is a valid CAS Registry Number.