The CAS Registry Mumber 654059-21-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,5,4,0,5 and 9 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 654059-21: (8*6)+(7*5)+(6*4)+(5*0)+(4*5)+(3*9)+(2*2)+(1*1)=159 159 % 10 = 9 So 654059-21-9 is a valid CAS Registry Number.
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