The CAS Registry Mumber 22478-51-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,4,7 and 8 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 22478-51: (7*2)+(6*2)+(5*4)+(4*7)+(3*8)+(2*5)+(1*1)=109 109 % 10 = 9 So 22478-51-9 is a valid CAS Registry Number.
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