The CAS Registry Mumber 54142-91-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,1,4 and 2 respectively; the second part has 2 digits, 9 and 1 respectively. Calculate Digit Verification of CAS Registry Number 54142-91: (7*5)+(6*4)+(5*1)+(4*4)+(3*2)+(2*9)+(1*1)=105 105 % 10 = 5 So 54142-91-5 is a valid CAS Registry Number.
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