The CAS Registry Mumber 60343-84-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,3,4 and 3 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 60343-84: (7*6)+(6*0)+(5*3)+(4*4)+(3*3)+(2*8)+(1*4)=102 102 % 10 = 2 So 60343-84-2 is a valid CAS Registry Number.