The CAS Registry Mumber 89957-81-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,9,5 and 7 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 89957-81: (7*8)+(6*9)+(5*9)+(4*5)+(3*7)+(2*8)+(1*1)=213 213 % 10 = 3 So 89957-81-3 is a valid CAS Registry Number.
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