0.01
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It is then 30,000 rounded to 1 significant figure
It is: 4000 rounded to one significant figure
There is no such thing as a nearest significant figure. For sf (as with decimal places) it is necessary to specify how many. 0.00747 to 1 sf is 0.007, to 2 sf it is 0.0075, to 3 sf it is 0.00747, to 4 sf it is 0.007470 and so on.
Rounded to 1 significant figure it is 0.4
6694 rounded to 1 significant figure is 7000