The CAS Registry Mumber 68440-74-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,4,4 and 0 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 68440-74: (7*6)+(6*8)+(5*4)+(4*4)+(3*0)+(2*7)+(1*4)=144 144 % 10 = 4 So 68440-74-4 is a valid CAS Registry Number.
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