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
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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