The CAS Registry Mumber 84050-60-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,0,5 and 0 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 84050-60: (7*8)+(6*4)+(5*0)+(4*5)+(3*0)+(2*6)+(1*0)=112 112 % 10 = 2 So 84050-60-2 is a valid CAS Registry Number.