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Scale and rates
Maps/plans and choosing a scale; Drawing scaled diagrams; Length, area and volume scale factors; Speed, flow and density rates; changing rate units
Example 1
A plan uses scale 1:300. A wall is 5cm on the plan. Find its real length in metres.
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Answer: 15
- Multiply by the scale factor, then divide centimetres by 100.
Example 2
Water flows at 4 litres per minute for 30 minutes. Find the volume, in litres.
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Answer: 120
- Volume = rate × time.
Example 3
A vehicle uses 2L per 100km. How many litres are used for 400km?
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Answer: 8
- Multiply the per−100−km consumption by the number of 100−km blocks.
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