The CAS Registry Mumber 198637-81-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,8,6,3 and 7 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 198637-81: (8*1)+(7*9)+(6*8)+(5*6)+(4*3)+(3*7)+(2*8)+(1*1)=199 199 % 10 = 9 So 198637-81-9 is a valid CAS Registry Number.
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