Distance from home to school

1. purpose

1.1. know the distance

1.2. know travel time

1.3. find shortest distance

2. how to measure?

2.1. measuring tape

2.2. string

2.3. drive car

2.4. count lamp post

2.5. use internet distance finder?

2.6. walking time

3. units

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