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Cambridge IGCSE Mathematics

1.11Ratio and proportion

Ratio and proportion in Cambridge IGCSE Mathematics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 1.11.1Write ratios in their simplest form.
  2. 1.11.2Share a quantity in a given ratio.
  3. 1.11.3Use proportional reasoning and ratios in context, for example adapting recipes, using map scales and deciding which option is better value.

Lessons

  • Ratio and proportion

    30 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Ratio and proportion: sample question

1 mark

Write 75 cm:3 m75\ \text{cm} : 3\ \text{m} as a ratio in its simplest form.

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