The CAS Registry Mumber 155191-83-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,5,1,9 and 1 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 155191-83: (8*1)+(7*5)+(6*5)+(5*1)+(4*9)+(3*1)+(2*8)+(1*3)=136 136 % 10 = 6 So 155191-83-6 is a valid CAS Registry Number.
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