The CAS Registry Mumber 2130-29-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,1,3 and 0 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 2130-29: (6*2)+(5*1)+(4*3)+(3*0)+(2*2)+(1*9)=42 42 % 10 = 2 So 2130-29-2 is a valid CAS Registry Number.
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