The CAS Registry Mumber 33990-99-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,9,9 and 0 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 33990-99: (7*3)+(6*3)+(5*9)+(4*9)+(3*0)+(2*9)+(1*9)=147 147 % 10 = 7 So 33990-99-7 is a valid CAS Registry Number.
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