- Since 6 is in the tenths place, 13.688 is between 13.6 and 13.7
- 13.65 is the midpoint between 13.6 (13.60) and 13.7 (13.70)
- As illustrated on the number line, 13.688 is greater than the midpoint (13.65)
- Therefore, 13.688 rounded to the nearest tenth (one decimal place) = 13.7
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