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RP.8.1

Ratio notation

Use ratio notation

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 2–4 Core 🇬🇧 UK

GCSE Maths - What are Ratios & How to Simplify Them (Part 1) (2026/27 exams)

Cognito 203K views

Clear UK intro to what a ratio is and how to simplify one.

Jump to 0:13What is a Ratio?0:54Simplifying Ratios 1:33Meaning of Simplified Ratios 3:14Ratios Involving Totals 4:07Ratios with More Than Two Values

Grade 2–5 Core 🇬🇧 UK

Writing and Simplifying a Ratio - GCSE Maths

1st Class Maths 44K views

Writing and simplifying ratios, including three-part and mixed-unit examples.

Jump to 0:13What is a ratio?1:03Simplifying a ratio (2 quantities)4:15Simplifying a ratio (3 quantities)6:40Worded question 2 (with mixed units)

Grade 2–4 Core 🇺🇸 US

Introduction to Ratios (What Are Ratios?) | Ratio Examples and Answers

Math with Mr. J 1.7M views

Simple, well-paced introduction to what ratios are and how to write them.