The CAS Registry Mumber 1912-53-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,9,1 and 2 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1912-53: (6*1)+(5*9)+(4*1)+(3*2)+(2*5)+(1*3)=74 74 % 10 = 4 So 1912-53-4 is a valid CAS Registry Number.
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