AMC10 2021 10B, Problem 1

How many integer values of $x$ satisfy $|x|<3\pi$?

Solution: Since $3\pi\approx9.42$, we multiply $9$ by $2$ for the integers from $1$ to $9$ and the integers from $-1$ to $-9$ and add $1$ to account for $0$ to get $\fbox{19}$.

Answer: 19