SOLUTION STEPS (Set 7):
  1. Write all numbers with 3 decimal places: 6.058, 6.580, 6.508, 6.085.
  2. Compare tenths: 6.058 and 6.085 both have tenths 0 (smallest). Compare hundredths: 5 < 8, so 6.058 is smaller.
  3. The smallest number is 6.058. Match the first option.