The CAS Registry Mumber 52248-40-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,2,2,4 and 8 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 52248-40: (7*5)+(6*2)+(5*2)+(4*4)+(3*8)+(2*4)+(1*0)=105 105 % 10 = 5 So 52248-40-5 is a valid CAS Registry Number.
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