The CAS Registry Mumber 21404-81-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,4,0 and 4 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 21404-81: (7*2)+(6*1)+(5*4)+(4*0)+(3*4)+(2*8)+(1*1)=69 69 % 10 = 9 So 21404-81-9 is a valid CAS Registry Number.
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