The CAS Registry Mumber 856683-47-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,5,6,6,8 and 3 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 856683-47: (8*8)+(7*5)+(6*6)+(5*6)+(4*8)+(3*3)+(2*4)+(1*7)=221 221 % 10 = 1 So 856683-47-1 is a valid CAS Registry Number.
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