The CAS Registry Mumber 178680-20-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,8,6,8 and 0 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 178680-20: (8*1)+(7*7)+(6*8)+(5*6)+(4*8)+(3*0)+(2*2)+(1*0)=171 171 % 10 = 1 So 178680-20-1 is a valid CAS Registry Number.
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