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The figure in the tenths position is a zero, so the number is rounded down, giving 2 as the answer.
We look at the figure in the thousands place, and as it is a 1, then the number is rounded down. That gives 620000 as the answer.
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.
30.54 rounded to one decimal place = 30.5. Because the least significant digit is 4 it is rounded down. Had it been 5 or above the answer would have been rounded up to 30.6
As the first digit after the decimal place is a zero, the overall figure is rounded down to 567.