Roots near 9

For how many integers 𝑛 is the difference between √𝑛 and 9 is less than 1?
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative


Given that $n$ is an integer, and the difference between $\sqrt n$ and $9$ is less than $1$, how many different possibilities are there for $n$?

This problem is taken from the World Mathematics Championships