The CAS Registry Mumber 30840-02-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,0,8,4 and 0 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 30840-02: (7*3)+(6*0)+(5*8)+(4*4)+(3*0)+(2*0)+(1*2)=79 79 % 10 = 9 So 30840-02-9 is a valid CAS Registry Number.
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