- Since 2 is in the tenths place, 21.225 is between 21.2 and 21.3
- 21.25 is the midpoint between 21.2 (21.20) and 21.3 (21.30)
- As illustrated on the number line, 21.225 is less than the midpoint (21.25)
- Therefore, 21.225 rounded to the nearest tenth (one decimal place) = 21.2
%20with%20a%20number%20line.png "21.225 rounded to the nearest tenth (one decimal place) with a number line")
