The CAS Registry Mumber 55609-61-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,6,0 and 9 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 55609-61: (7*5)+(6*5)+(5*6)+(4*0)+(3*9)+(2*6)+(1*1)=135 135 % 10 = 5 So 55609-61-5 is a valid CAS Registry Number.
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