It is: 4000 rounded to one significant figure
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When expressing a number to 1 significant figure, you round it to the nearest power of 10. In the case of 4382, the first significant figure is 4, and the rest of the digits are considered non-significant. Therefore, 4382 to 1 significant figure is 4000.
Oh, dude, you just want one significant figure? Well, 4382 to one significant figure is like, 4000. Just chop off all those extra numbers and call it a day. Who needs precision anyway, right?
Rounded to 1 significant figure it is 0.4
0.00009893 to 1 significant figure = 0.0001
6694 rounded to 1 significant figure is 7000
99.6 rounded to 1 significant figure is 100
6,256 rounded to 1 significant figure is 6,000