The CAS Registry Mumber 157640-54-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,6,4 and 0 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 157640-54: (8*1)+(7*5)+(6*7)+(5*6)+(4*4)+(3*0)+(2*5)+(1*4)=145 145 % 10 = 5 So 157640-54-5 is a valid CAS Registry Number.
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