The CAS Registry Mumber 227750-12-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,7,7,5 and 0 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 227750-12: (8*2)+(7*2)+(6*7)+(5*7)+(4*5)+(3*0)+(2*1)+(1*2)=131 131 % 10 = 1 So 227750-12-1 is a valid CAS Registry Number.
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