The CAS Registry Mumber 185810-98-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,8,1 and 0 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 185810-98: (8*1)+(7*8)+(6*5)+(5*8)+(4*1)+(3*0)+(2*9)+(1*8)=164 164 % 10 = 4 So 185810-98-4 is a valid CAS Registry Number.
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