Which of the following numbers is closest to 10 ?
(A) 1
(B) 5
(C) 8
(D) 13
(E) 19
Arranging the five answers along with 10 from smallest to largest, we get 1, 5, 8, 10,13, 19 . Since 10 is 2 more than 8 and 10 is 3 less than 13, then 8 is the closest number to 10.

ANSWER: $(\mathrm{C})$