The CAS Registry Mumber 1646-61-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,6,4 and 6 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1646-61: (6*1)+(5*6)+(4*4)+(3*6)+(2*6)+(1*1)=83 83 % 10 = 3 So 1646-61-3 is a valid CAS Registry Number.
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