numbers makes numbers easier to work with in your head. Round
numbers will end with 0. It is an estimate or "about
this much" - "About 50 students came to the game."
Even though there were exactly 53. The column below (to the
right of) the place value to round to will tell which number
to round to.
1,2,3 & 4: Round down. 5,6,7,8,9: