Three: 3, 9 and 0.

2 of them.

4 significant figures.

Three figures are significant here.

10 significant figures.

231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

There are 5 significant figures in 70700 as the zeros are between and after the numbers.

2 significant figures.

7 significant figures.

4 significant figures

3 significant figures.

5 significant figures.

It has five significant figures.

There are 5 significant figures.

Two significant figures.

Four significant figures.

Three significant figures.

It has 4 significant figures

9843.6 has five significant figures because all non-zero numbers are significant.

The number given of 11254 has five significant figures

1.000003 has 7 significant figures.

Two significant figures (3,4).

0.80002 has 5 significant figures.

120.0 has 4 significant figures.

It has 3 significant figures. (1,5,8).

Two significant figures (2,3).

13.60 has 4 significant figures.

30.900 has 5 significant figures.

250.95 has 5 significant figures.

0.0310 has 3 significant figures.

Three significant figures. 3 of them.

Two significant figures (8,9).

Two significant figures (2,8).

0.00909 has 3 significant figures.

2310 has 3 significant figures.