The CAS Registry Mumber 1421232-63-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,2,1,2,3 and 2 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1421232-63: (9*1)+(8*4)+(7*2)+(6*1)+(5*2)+(4*3)+(3*2)+(2*6)+(1*3)=104 104 % 10 = 4 So 1421232-63-4 is a valid CAS Registry Number.
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