Two significant figures (2,3).
Because 10.00400 is 10.004, this has five significant digits (numbers).
3 significant figures.
Four significant figures.
Three significant figures.
One significant figure.
2300.m has four significant figures.
All digits are significant except zeros closest to the decimal place. Thus, the 2300 at the end are all significant, giving four significant digits
Two of them
2
It has 2 significant figures. However, the fact that it is given as 2300 mm and not as 230 cm suggests that it is, in fact significant to 4 figures.
Rice crispy squares? A lot! --- but --- 2300 sq ft would be 2300 squares, each of which is 1 ft by 1 ft; or one square which is sqRt( 2300 ) ft by sqRt( 2300 ) ft. - where sqRt( 2300 ) is the square root of 2300, which is, to five significant figures, 47.958.
2300
0.0343
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
Integers with trailing 0s are ambiguous. There are at least two significant digits but, if the number is known to be accurate to the nearest integer, there are 4
2000
The figure 18.03 has a total of four significant numbers