The CAS Registry Mumber 6112-35-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,1,1 and 2 respectively; the second part has 2 digits, 3 and 5 respectively. Calculate Digit Verification of CAS Registry Number 6112-35: (6*6)+(5*1)+(4*1)+(3*2)+(2*3)+(1*5)=62 62 % 10 = 2 So 6112-35-2 is a valid CAS Registry Number.