The first step in taking any number to 1 significant figure is to find the greatest non-zero digit. In this case it is the 2, as that represents 2 tenths. The next step is to look at the next digit on. If it is 5, 6, 7, 8 or 9 we need to round up. Otherwise, we can leave it as it is. The next digit is 0, so we don't need to round up. Therefore 0.209 rounded to 1 significant figure is 0.2
37.753 rounded to one significant figure becomes 40
6048 rounded to one significant figure becomes 6000
18.4 rounded to one significant figure becomes 20
400
2
6694 rounded to 1 significant figure is 7000
99.6 rounded to 1 significant figure is 100
2300 rounded to 1 significant figure is 2000.
30,569 rounded off to 1 significant figure is 30,000
0.00584 rounded off to 1 significant figure is 0.006
6,256 rounded to 1 significant figure is 6,000
470 rounded to one significant figure is 500
541713 rounded to one significant figure is 500000.
Rounded to 1 significant figure it is 0.4
It already is rounded to three significant figures.
26112 rounded to one significant figure results in 30000
54.26 rounded to 1 significant figure is 50