The CAS Registry Mumber 90490-59-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,4,9 and 0 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 90490-59: (7*9)+(6*0)+(5*4)+(4*9)+(3*0)+(2*5)+(1*9)=138 138 % 10 = 8 So 90490-59-8 is a valid CAS Registry Number.
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