For doing significant figure you down count from the start the required amount, so 645533 would become 646000.
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There are three significant figures in the number 102.
62 rounded to one significant figure is 60. 57 rounded to one significant figure is 60. 573 rounded to one significant figure is 600. 0.0573 rounded to one significant figure is 0.06. In each of these answers the 6 is the only significant figure.
25.488000000000003
It already is rounded to three significant figures.
9, every number counts as a significant figure except leading zeroes and any zero without a different digit after it is not a significant figure unless there is a decimal point after it. i.e. 0500 has 1 significant digit, 501 has 3, and 500. has 3