The CAS Registry Mumber 84131-88-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,1,3 and 1 respectively; the second part has 2 digits, 8 and 8 respectively. Calculate Digit Verification of CAS Registry Number 84131-88: (7*8)+(6*4)+(5*1)+(4*3)+(3*1)+(2*8)+(1*8)=124 124 % 10 = 4 So 84131-88-4 is a valid CAS Registry Number.
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