Rounded to one significant figure it becomes 10
10 significant figures.
Round 12 to 1 significant figure is 10.
To 1 significant figure, it would be 8 x 10^3.
10
One.
10
10
When expressing a number to one significant figure, you round the number to the nearest power of 10. In this case, 9862 to one significant figure would be 10,000. This is because the first digit from the left is 9, which is closer to 10 than 10000.
It is 10
11.5
It depends to what degree of accuracy: 10.25 (2 Decimal Places) 10.3 (1 Decimal Place) 10 (0 Decimal Places) 10 (1 Significant Figure) I included 1 Significant Figure for your future reference. If the number was 11.245 then to 1 Significant figure would be 10 because 0 does not count as a figure and therefore the 1 in 11 would be the only FIGURE.