Length
How long, tall or far something is. Measured in metres, centimetres, millimetres and kilometres in most of the world, and in inches, feet and miles in a few places.
Depth 1 · Foundation
You know the metre and where it came from, and use centimetres, millimetres and kilometres for small and big lengths.
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- 1
Foundation
You know the metre and where it came from, and use centimetres, millimetres and kilometres for small and big lengths.
- 2
Deeper
You know the inch, foot and mile, and roughly how they compare with metric lengths.
Master depth 1 first
Your path here
What's still between you and Length, depth 1, in the order you can learn it.
Where it fits
Makes these deeper
Once you know Length, come back to these — they'll mean more.