The CAS Registry Mumber 28821-57-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,8,2 and 1 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 28821-57: (7*2)+(6*8)+(5*8)+(4*2)+(3*1)+(2*5)+(1*7)=130 130 % 10 = 0 So 28821-57-0 is a valid CAS Registry Number.
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