Answer:here are two kinds of numbers in the world
exact:
example: There are exactly 12 eggs in a dozen.
example: Most people have exactly 10 fingers and 10 toes.
inexact numbers:
example: any measurement.
If I quickly measure the width of a piece of notebook paper, I might get 220 mm (2 significant figures). If I am more precise, I might get 216 mm (3 significant figures). An even more precise measurement would be 215.6 mm (4 significant figures).
Explanation: