1100 to 3 significant figures is 1.10e3
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2808 into 3 significant figures is 2810
e A number that has only 1 significant figure can't be rounded to 3 significant figures
5,560
0.000039 as you have to round it up. 3 and 8 are the significant figures but as you must round up, the answer becomes 0.000039.
To round 233.356 to 2 significant figures, you first identify the first two non-zero digits from the left, which are 2 and 3. The digit after the second significant figure is 3. Since 3 is greater than 5, you round up the last significant figure. Therefore, rounding 233.356 to 2 significant figures gives you 230.