The CAS Registry Mumber 25825-51-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,8,2 and 5 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 25825-51: (7*2)+(6*5)+(5*8)+(4*2)+(3*5)+(2*5)+(1*1)=118 118 % 10 = 8 So 25825-51-8 is a valid CAS Registry Number.
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