The CAS Registry Mumber 115846-54-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,8,4 and 6 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 115846-54: (8*1)+(7*1)+(6*5)+(5*8)+(4*4)+(3*6)+(2*5)+(1*4)=133 133 % 10 = 3 So 115846-54-3 is a valid CAS Registry Number.