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
When multiplying/dividing measurements the answers needs to have the same amound significant figures as the one with the LEAST amount
50.4 has three significant digits.
Any measurement may have two significant digits.
302.5 grams
2 of them.
When adding or subtracting measurements, the result should have the same number of decimal places as the measurement with the fewest decimal places. When multiplying or dividing measurements, the result should have the same number of significant figures as the measurement with the fewest significant figures.
5 of them.
30.5 cm
2 of them.
102.3 cm