What is a ratio?
A Ratio is a way of comparing one part of a whole to another.
A Ratio can also be expressed as a Fraction (of the whole).
We often use a ratio (instead of a fraction) when we are trying to show how things are shared out or in any situation where we might use Scale Factors.
How to work with ratios
- Put what you know in RATIO form (use more than one line if necessary)
- Add “extra bits” (eg Total, Difference, Sum) if you think they might be useful
- Use SCALE FACTORS to complete lines
- Pick out the ANSWER!
Edexcel GCSE Maths Notes
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