Which of the following numbers is closest to 1 ?
(A) $\frac{3}{4}$
(B) 1.2
(C) 0.81
(D) $1 \frac{1}{3}$
(E) $\frac{7}{10}$
In decimal form, the five possible answers are

$$0.75,1.2,0.81,1.333 \ldots, 0.7$$

The differences between 1 and these possiblities are

$$
1-0.75=0.25 \quad 1.2-1=0.2 \quad 1-0.81=0.19 \quad 1.333 \ldots-1=0.333 \ldots \quad 1-0.7=0.3
$$

The possibility with the smallest difference with 1 is 0.81 , so 0.81 is closest to 1 .

ANSWER: (C)