Ah, that's a wonderful question. When we round 0.36009 to one significant figure, we look at the first non-zero digit from the left. In this case, that digit is 3, so when we round, the number becomes 0.4. Just like that, we've simplified it to one significant figure.
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When rounding to one significant figure, you look at the first non-zero digit from the left. In this case, the first non-zero digit is 3. Since the digit immediately after 3 is 6, which is 5 or greater, you round up. Therefore, 0.36009 rounded to one significant figure is 0.4.
0.40000
200 Explanation: 2 is the one significant figure. The zeros are not significant. Round up because it is closer to 200 than to 100.
0.04
When expressing a number to one significant figure, you round the number to the nearest power of 10. In this case, 9862 to one significant figure would be 10,000. This is because the first digit from the left is 9, which is closer to 10 than 10000.
To round 350 to one sig fig, you will round to the hundreds place. 350 rounds up to 400 which is one sig fig.
1000 is written with one significant figure, with only the 1 being a significant figure.