- Since 2 is in the tenths place, 40.21 is between 40.2 and 40.3
- 40.25 is the midpoint between 40.2 (40.20) and 40.3 (40.30)
- As illustrated on the number line, 40.21 is less than the midpoint (40.25)
- Therefore, 40.21 rounded to the nearest tenth (one decimal place) = 40.2
%20with%20a%20number%20line.png "40.21 rounded to the nearest tenth (one decimal place) with a number line")
