The CAS Registry Mumber 156764-54-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,7,6 and 4 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 156764-54: (8*1)+(7*5)+(6*6)+(5*7)+(4*6)+(3*4)+(2*5)+(1*4)=164 164 % 10 = 4 So 156764-54-4 is a valid CAS Registry Number.
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