If $1+1.1+1.11+\square=4.44$, what number should be put in the box to make the equation true?
(A) 3.33
(B) 1.23
(C) 0.12
(D) 2.13
(E) 3.21
Since $1+1.1+1.11=3.21$, then to get a sum of 4.44 , we still need to add $4.44-3.21=1.23$. Thus, the number which should be put in the box is 1.23 .

ANSWER: (B)