The CAS Registry Mumber 84299-11-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,2,9 and 9 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 84299-11: (7*8)+(6*4)+(5*2)+(4*9)+(3*9)+(2*1)+(1*1)=156 156 % 10 = 6 So 84299-11-6 is a valid CAS Registry Number.