Solving Linear Inequalities — Interactive Lesson (Ages 13–14)

Still explaining why the inequality sign flips when multiplying or dividing by a negative? This 23-slide interactive lesson gives pupils focused, self-marking practice solving linear inequalities.

Mastering Linear Inequalities in Year 9 Maths

Pupils practise solving linear inequalities, including the rule for flipping the inequality sign, building the fluency within the Year 9 National Curriculum algebra strand. Getting the sign-flipping rule genuinely secure at this stage prevents a persistent source of errors that otherwise resurfaces repeatedly at GCSE.

What’s Included

• 23-slide interactive lesson on solving linear inequalities
• Practice applying the sign-flipping rule correctly
• Self-marking activities with instant feedback
• Step-by-step guidance through the full solving method

Key Benefits for Students

• Builds genuine fluency solving linear inequalities
• Instant feedback confirms correct working straight away
• Secures the sign-flipping rule before it causes GCSE errors
• Extensive practice across a substantial number of slides
• Reinforces the connection between solving equations and inequalities

Why Teachers Love It

• No prep — ready to use on any interactive whiteboard
• Self-marking format supports independent practice
• Substantial enough to carry a full lesson on this topic
• A dependable resource for a skill pupils often find tricky
• Works equally well as a first teach or a focused revision refresher

Love this? You’ll love…

• Adding and Subtracting Decimals — Interactive Lesson (Ages 11–14)
• Substitution into Formulae and Expressions — Interactive Lesson (Ages 11–14)
• Pythagorean Theorem: Finding Side Lengths — Interactive Lesson (Ages 11–14)

A strong addition to a Year 9 algebra topic, whether taught as the main lesson or used for focused revision before GCSE questions build directly on this method. Pupils who master the sign-flipping rule confidently here carry that same care and attention into every later algebra topic that touches this area of maths, well beyond this single Year 9 unit of algebra work.

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FAQ

What year group is this for? Year 9 (ages 13–14).

Does it cover the sign-flipping rule? Yes, this is covered explicitly throughout the lesson.

Is it self-marking? Yes, instant feedback throughout.