The CAS Registry Mumber 173720-80-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,7,2 and 0 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 173720-80: (8*1)+(7*7)+(6*3)+(5*7)+(4*2)+(3*0)+(2*8)+(1*0)=134 134 % 10 = 4 So 173720-80-4 is a valid CAS Registry Number.
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