It can be in scientific notation 2.5*10-4 km or 1/4000 km as a fraction
There are 1000 meters in a kilometer
50.4 has three significant digits.
5 significant figures.
2 of them.
38 cm
They tell you what level of precision you can expect from measurements that are made using that instrument.
Measurements need to be specific so we use significant digits.
4
50.4 has three significant digits.
Any measurement may have two significant digits.
When multiplying/dividing measurements the answers needs to have the same amound significant figures as the one with the LEAST amount
302.5 grams
2 of them.
5 of them.
102.3 cm
3.2 cm
2
2 of them.