The CAS Registry Mumber 64875-27-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,8,7 and 5 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 64875-27: (7*6)+(6*4)+(5*8)+(4*7)+(3*5)+(2*2)+(1*7)=160 160 % 10 = 0 So 64875-27-0 is a valid CAS Registry Number.