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RP.2.3

Equations of direct proportion

Write and use equations to solve problems involving direct proportion

4 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 4–7 Core 🇬🇧 UK

GCSE Maths - How to Write Algebraic Expressions for Directly Proportional Relationships

Cognito 101K views

Turns 'y is proportional to x' into an equation and finds the constant k.

Jump to 0:00Intro to Direct Proportionality 0:27Writing Equations for Direct Proportion 1:08Example 1: Time and Mass 2:03Example 1: Finding the Constant of Proportionality (k)3:10Example 1: Writing the Proportionality Equation 3:25Example 1: Using the Equation to Find an Unknown Value

Grade 4–6 Core 🇬🇧 UK

Direct Proportion - Corbettmaths

corbettmaths 473K views

Clear walkthrough of the proportionality symbol and finding the constant of proportionality.

Grade 4–8 Core 🇬🇧 UK

Direct/Inverse Proportion - GCSE Higher Maths

1st Class Maths 302K views

Four worked direct proportion examples building the equation and solving for unknowns.

Jump to 0:18What is direct proportion?2:49Direct Proportion Example 1 5:04Direct Proportion Example 2 6:30Direct Proportion Example 3 8:08Direct Proportion Example 4

Grade 4–7 Core 🇬🇧 UK

Direct Proportion

Maths Genie 264K views

Focused direct proportion lesson forming the equation and finding k, exam-style.