10800 meters has 3 significant figures.
1 m3 = 1000 l ⇒ 10800 m3 = 10800000 l (= 10.8 million liters).
900 ' = 10800 "
10800/3 = 3600 yards
1000 milligrams = 1 gram so 10800 milligrams = 10800/1000 = 10.8 grams. Simple!
There are 12 inches in one foot. Therefore, 10800 inches is equal to 10800/12 = 900 feet.
231.57 has five significant figures/numbers. All the numbers in 231.57 are significant.
There are four significant figures in the measurement 612.3 meters.
If you mean "How many significant figures are there in 314.721 meters then the answer is 6.
The figure 18.03 has a total of four significant numbers
10800
10800 seconds.
3 significant figures.