The CAS Registry Mumber 258-91-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,5 and 8 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 258-91: (5*2)+(4*5)+(3*8)+(2*9)+(1*1)=73 73 % 10 = 3 So 258-91-3 is a valid CAS Registry Number.
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