1000 is written with one significant figure, with only the 1 being a significant figure.
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Rounded to one significant figure it becomes 20
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.
When it's truncated to one significant figure . . . 20When it's rounded to one significant figure . . . . 30
5.63 converts to 6 as one significant figure.
It has 1 significant figure.