You are asked to find the volume of a cube that is 2.5 cm high, 2.65 cm wide, and 3.456 cm long. How many significant figures should you show in your answer?
I invite comment on this one
2.5 only has 2 significant figures so i think that your answer should probably only have 2 significant figures.
you would show one hole and the 3 seprit one it for l*w*h=mass.
As many as you want. It varies on accuracy.