It is 40000.
There are 4 significant figures in 0.0032. Seems to be only 2 significant figures in this number.
all the zeros are significant. there are four significant figures.
There are two significant figures which are the two 2s.
22.1 to two significant figures = 22
23.81558 to two significant figures is 24.
42 has two significant figures.
There are two significant figures in 0.00013.
Two significant figures.
Two significant figures.
Two of them.
The significant figures for 56g are two, as there are two non-zero digits in the number.