The CAS Registry Mumber 53303-91-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,3,0 and 3 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 53303-91: (7*5)+(6*3)+(5*3)+(4*0)+(3*3)+(2*9)+(1*1)=96 96 % 10 = 6 So 53303-91-6 is a valid CAS Registry Number.
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