Distance from home to school

1. how to measure?

1.1. measuring tape

1.2. string

1.3. drive car

1.4. count lamp post

1.5. use internet distance finder?

1.6. walking time

2. purpose

2.1. know the distance

2.2. know travel time

2.3. find shortest distance

3. units

3.1. km, cm, m, mm.....