Two.
23.43 rounded to two significant figures is 23.
Two of them and they are 23
0.0023
0.0175
0.0342
108.6957
24000
3 of them.
23
Significant Others - 2007 was released on: USA: 23 November 2007 (Los Angeles, California)
There are 6.02214076 x 10^23 carbon atoms in a mole of 12C with eight significant figures.