The CAS Registry Mumber 40752-81-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,7,5 and 2 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 40752-81: (7*4)+(6*0)+(5*7)+(4*5)+(3*2)+(2*8)+(1*1)=106 106 % 10 = 6 So 40752-81-6 is a valid CAS Registry Number.
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