The CAS Registry Mumber 19846-27-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,8,4 and 6 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 19846-27: (7*1)+(6*9)+(5*8)+(4*4)+(3*6)+(2*2)+(1*7)=146 146 % 10 = 6 So 19846-27-6 is a valid CAS Registry Number.