phy pp6 , significant figures?

[irlzs95]

hey guyz , i wanted to ask in phy pp6 how many significant fiugures do we usually write the answers in ??
cuz sometimes they want 2 sf , nd sometimes 3 , sometimes they accept both

how am i supposed to noe ?

hope someone knws
thank u !

 

[haochen]

u must at least write 3 sig fig in in the answer