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
18.4 rounded to one significant figure becomes 20
6048 rounded to one significant figure becomes 6000
40000
400
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
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
Rounded to 1 significant figure it is 0.4
470 rounded to one significant figure is 500
541713 rounded to one significant figure is 500000.
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