NumberKey Facts

Understanding Ratios

Part of Ratio BasicsGCSE Mathematics

This key facts covers Understanding Ratios within Ratio Basics for GCSE Mathematics. Revise Ratio Basics in Number for GCSE Mathematics with 12 exam-style questions and 22 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 2 of 14 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 2 of 14

Practice

12 questions

Recall

22 flashcards

Understanding Ratios

  • Definition: A ratio compares quantities of the same kind
  • Notation: Written as a:b or a/b or "a to b"
  • Simplest form: Like fractions, ratios should be simplified
  • Parts: In 3:5, there are 3+5=8 parts total
  • Order matters: 2:3 is different from 3:2

Keep building this topic

Read this section alongside the surrounding pages in Ratio Basics. That gives you the full topic sequence instead of a single isolated revision point.

Practice Questions for Ratio Basics

Write the ratio 12:18 in its simplest form.

  • A. 6:9
  • B. 4:6
  • C. 2:3
  • D. 3:2
1 markfoundation

Explain the difference between the ratio 3:5 and the ratio 5:3.

2 marksstandard

Quick Recall Flashcards

What is a ratio?
A comparison of quantities of the same kind Written as a:b or a/b Example: 3:5 means '3 parts to 5 parts'
Order in Ratios
Order MATTERS! Boys:Girls = 3:5 means: • 3 boys for every 5 girls Girls:Boys = 5:3 means: • 5 girls for every 3 boys Different meanings!

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