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GR.8.2

Finding the scale factor

Use the ratio of corresponding sides to work out scale factors

3 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.

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Grade 2–6 Recap 🇬🇧 UK

Calculating Scale Factors

Matt | MyGCSEMaths 4K views

Quick UK walkthrough of calculating the scale factor between two similar shapes.

Grade 2–6 Core 🇬🇧 UK

GCSE Maths - Similar Shapes (2026/27 exams)

Cognito 239K views

Clear full method: find the scale factor from similar shapes, then missing lengths.

Jump to 0:39Finding Unknown Side Lengths 1:00Example 1: Calculating the Scale Factor 2:32Example 2: Finding the Scale Factor

Grade 2–6 Core 🇺🇸 US

How to Find Scale Factor with Similar Figures

Mario's Math Tutoring 611K views

Explains the scale-factor formula and why the order of the shapes matters.

Jump to 0:13Explaining How the Order is Important for the Scale Factor 0:26Formula for Finding the Scale Factor 1:09Explanation if the Scale Factor is an Enlargement or a Reduction