35164 is 35200 rounded to 3 significant figures.
To round to 3 sig fig, use the 4th digit to decide whether to round up or down; digits after the first 3 are replaced by zeros:
4th digit is 6, so round up 35164 → 35200 to 3 sig fig.
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The first significant figure of 0.000169 is the 1 and it has 3 significant figures.
It is 25.7 when rounded to 3 significant figures
4, 3, 0, 2 and 3.
1050
7000 has ONE significant figure. The zeros are not significant. This can be written as 7x10^3.