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ALG.3.2

Rearrange formulae - subject in the denominator

Change the subject of a formula to be a variable in the denominator (e.g. trig ratios)

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 6–8 Core 🇬🇧 UK

Rearrange Formula: Make x the subject when x in denominator and numerator of a fraction

Maths with Jay 4K views

Exactly your lesson: makes x the subject when x sits in the denominator, step by step.

Jump to 0:00Introduction 0:18Multiply by denominator 0:33Expand brackets 0:55Collect x terms on LHS 1:19Factorise LHS 1:34Divide both sides by coefficient of x

Grade 6–8 Core 🇬🇧 UK

GCSE Maths - Rearranging Formulas Part 2 - When The Subject Appears Twice (2026/27 exams)

Cognito 197K views

Clear four-step method for when the subject appears twice, including clearing fractions and factorising.

Jump to 0:00Intro: Changing the subject when it appears multiple times 0:46Example 1: Making x the subject (Step 1)1:41Step 2: Collect Subject Terms 3:30Step 3: Factorise Subject Terms 3:55Step 4: Isolate the Subject 4:33Example 2: Making b the subject

Grade 6–8 Core 🇬🇧 UK

Rearranging Harder Formulae

Maths Genie 172K views

Maths Genie tackles harder rearranging including fractions and the subject appearing in denominators.

Grade 7–9 Stretch 🇬🇧 UK

Changing the Subject - Harder Formulae (Higher Only) | GCSE Maths Tutor

The GCSE Maths Tutor 187K views

Higher-only harder formulae including fractions and the subject appearing twice; good exam-level practice.