The CAS Registry Mumber 22274-12-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,2,7 and 4 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 22274-12: (7*2)+(6*2)+(5*2)+(4*7)+(3*4)+(2*1)+(1*2)=80 80 % 10 = 0 So 22274-12-0 is a valid CAS Registry Number.