The CAS Registry Mumber 90042-99-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,0,4 and 2 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 90042-99: (7*9)+(6*0)+(5*0)+(4*4)+(3*2)+(2*9)+(1*9)=112 112 % 10 = 2 So 90042-99-2 is a valid CAS Registry Number.
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