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To change 3.20 into 2 significant figures, simply round it to 3.2. The zero after the 2 is removed as it is not significant when there are only 2 significant figures.
Five, two and five sig figs respectively.
2 significant figures: 5 and 6.
there are 2 significant figures in 21000 2 & 1 are the significant figures.
To round 12.555 km to four significant figures, you would keep the first four non-zero digits, which are 12.56 km since the next digit (5) is greater than 5.