- Since 5 is in the tenths place, 12.587 is between 12.5 and 12.6
- 12.55 is the midpoint between 12.5 (12.50) and 12.6 (12.60)
- As illustrated on the number line, 12.587 is greater than the midpoint (12.55)
- Therefore, 12.587 rounded to the nearest tenth (one decimal place) = 12.6
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