The CAS Registry Mumber 13657-58-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,3,6,5 and 7 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 13657-58: (7*1)+(6*3)+(5*6)+(4*5)+(3*7)+(2*5)+(1*8)=114 114 % 10 = 4 So 13657-58-4 is a valid CAS Registry Number.
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