It cannot be converted to one significant digit as all three digits are significant.
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1000 is written with one significant figure, with only the 1 being a significant figure.
Rounded to one significant figure it becomes 20
When it's truncated to one significant figure . . . 20When it's rounded to one significant figure . . . . 30
It has 1 significant figure.
5.63 converts to 6 as one significant figure.