They are all significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
42 has two significant figures.
Rounded to two significant figures it becomes 1.0e4
Rounded to two significant figures it becomes 3.6
23.43 rounded to two significant figures is 23.
687 to two significant figures is 690.
8468 rounded to 2 significant figures is 8500
There are 4 significant figures in 0.0032. Seems to be only 2 significant figures in this number.
There are two significant figures which are the two 2s.
all the zeros are significant. there are four significant figures.
22.1 to two significant figures = 22
42 has two significant figures.
23.81558 to two significant figures is 24.
It's already there.
Two of them.
Two significant figures.
Two significant figures.
The significant figures for 56g are two, as there are two non-zero digits in the number.