The CAS Registry Mumber 5210-13-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,1 and 0 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 5210-13: (6*5)+(5*2)+(4*1)+(3*0)+(2*1)+(1*3)=49 49 % 10 = 9 So 5210-13-9 is a valid CAS Registry Number.
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