The CAS Registry Mumber 1478-88-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,4,7 and 8 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1478-88: (6*1)+(5*4)+(4*7)+(3*8)+(2*8)+(1*8)=102 102 % 10 = 2 So 1478-88-2 is a valid CAS Registry Number.