The CAS Registry Mumber 186887-60-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,6,8,8 and 7 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 186887-60: (8*1)+(7*8)+(6*6)+(5*8)+(4*8)+(3*7)+(2*6)+(1*0)=205 205 % 10 = 5 So 186887-60-5 is a valid CAS Registry Number.
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