The CAS Registry Mumber 87899-19-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,8,9 and 9 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 87899-19: (7*8)+(6*7)+(5*8)+(4*9)+(3*9)+(2*1)+(1*9)=212 212 % 10 = 2 So 87899-19-2 is a valid CAS Registry Number.
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