Estimating the number 684.575 to one decimal place gives you 684.6 which is very close.
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Carried out or written to one decimal place . . . 184.2Rounded to one decimal place . . . . . 184.3
1.79246 = 1.8 in one decimal place
2.694 = 2.7 in one decimal place
3.046 to one decimal place is 3.0.
18.69 to one decimal place = 18.7