Study notes
Ratio & Proportion
Map scales in both directions, and recognising direct versus inverse proportion.
What this topic covers
- A map scale compares map distance to real distance
- Map to real: multiply by the scale factor
- Real to map: divide by the scale factor
- Direct proportion: both quantities grow together at a fixed rate
- Inverse proportion: one quantity grows as the other shrinks
- Decide which relationship fits before you calculate
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