The CAS Registry Mumber 54895-25-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,8,9 and 5 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 54895-25: (7*5)+(6*4)+(5*8)+(4*9)+(3*5)+(2*2)+(1*5)=159 159 % 10 = 9 So 54895-25-9 is a valid CAS Registry Number.