The CAS Registry Mumber 848499-17-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,8,4,9 and 9 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 848499-17: (8*8)+(7*4)+(6*8)+(5*4)+(4*9)+(3*9)+(2*1)+(1*7)=232 232 % 10 = 2 So 848499-17-2 is a valid CAS Registry Number.