The CAS Registry Mumber 84942-60-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,9,4 and 2 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 84942-60: (7*8)+(6*4)+(5*9)+(4*4)+(3*2)+(2*6)+(1*0)=159 159 % 10 = 9 So 84942-60-9 is a valid CAS Registry Number.