The CAS Registry Mumber 1910-08-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,1 and 0 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1910-08: (6*1)+(5*9)+(4*1)+(3*0)+(2*0)+(1*8)=63 63 % 10 = 3 So 1910-08-3 is a valid CAS Registry Number.