Which of the following integers round to $40$ when rounded to the nearest ten?
A. $43$
B. $23$
C. $38$
D. $51$
E. $45$
F. $35$
Express your answer as a block of letters corresponding to the answer choices that round to $40$, in alphabetic order with no punctuation. For example, if all six answer choices rounded to $40$, then your answer would be ABCDEF.
Consider each of the answer choices individually.
A. $43$ is between $40$ and $40+10=50$. Since $3$ is less than $5$, $43$ rounds down to ${\bf 40}$.
B. $23$ is between $20$ and $20+10=30$, so it cannot round to $40$.
C. $38$ is between $30$ and $30+10=40$. Because $8$ is greater than or equal to $5$, $38$ rounds up to ${\bf 40}$.
D. $51$ is between $50$ and $50+10=60$, so it cannot round to $40$.
E. $45$ is between $40$ and $40+10=50$. $5$ is greater than or equal to $5$, so $45$ rounds up to $50$.
F. $35$ is between $30$ and $30+10=40$. $5$ is greater than or equal to $5$, so $35$ rounds up to ${\bf 40}$.
The answer choices that round up to $40$ are A, C, and F. The final answer is $\boxed{\text{ACF}}$.