- Since 5 is in the tenths place, 5.51 is between 5.5 and 5.6
- 5.55 is the midpoint between 5.5 (5.50) and 5.6 (5.60)
- As illustrated on the number line, 5.51 is less than the midpoint (5.55)
- Therefore, 5.51 rounded to the nearest tenth (one decimal place) = 5.5
%20with%20a%20number%20line.png "5.51 rounded to the nearest tenth (one decimal place) with a number line")
