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Teach students to find the lowest common denominator and use equivalent fractions to add and subtract with this complete teaching bundle. Students review prime and composite numbers, find the lowest common denominator by listing multiples or using prime factors, rename both fractions and solve.

Combining a lesson plan, a 46-slide editable teacher presentation, three differentiated student activities, an exit ticket with interpretation guide and a hands-on Common Denominator Capture game, this curriculum-aligned bundle provides everything you need to teach the lesson from start to finish.

Built around the I Do, We Do, You Do model, students move from explicit teacher modelling to guided practice and independent application. They follow a four-step method (identify the denominators, find the lowest common denominator, rename the fractions, solve), correct a student who used too many prime factors, and compare a common denominator with the lowest one.

What's included in this teaching bundle?

Teacher Slides (PowerPoint)

• 46 editable, ready-to-teach slides following the I Do, We Do, You Do structure
• Clear learning intention and success criteria
• Review of prime numbers, composite numbers, factors and prime factors
• Four-step modelled examples with related and unrelated denominators
• Listing multiples and using prime factors to find the lowest common denominator
• Spot the error and why-use-the-lowest slides
• Every question slide followed by an answer slide
• Mini whiteboard check-ins throughout

Lesson Plan and Exit Ticket (PDF)

• Complete I Do, We Do, You Do lesson plan for a 45 to 60 minute lesson
• Diagnostic, formative and summative assessment points
• Key vocabulary, teacher notes and common misconceptions
• Exit ticket (two per page) with an interpretation guide

Differentiated Student Activities (PDF)

• Activity overview to help you match each option to your students
• Three differentiated activities: Renaming with Diagrams, Finding the Lowest Common Denominator and Reasoning with Common Denominators
• Fraction diagrams for renaming and a step-by-step prime factor scaffold
• Calculations with larger denominators, error analysis and a create-your-own task
• Answer key and marking guide for every activity

Class Recording Sheet (Excel)

• Type T, A or B and the cell colours itself: Working towards, Achieving, Working beyond
• Exit ticket results and activity evidence tabs, with numbered next teaching steps

Hands-On Activity: Common Denominator Capture (PDF)

• Partner game board with 32 lowest common denominator spaces
• Two calculation banks with 32 cards each and a strategy card
• LCD builder mat with 16 cut-out prime factor tiles, so students build each lowest common denominator by hand
• Capture record for logging each calculation, prime factors, LCD and renamed answer
• Teacher page with set-up, a model round, differentiation and misconceptions, plus answer keys for both banks
• What you need: scissors, pencils and 16 counters in two colours (or any small objects), plus printed pages

Ideal for upper primary classrooms, this bundle provides a structured approach to finding the lowest common denominator and renaming fractions to add and subtract, combining explicit instruction, visual representations, differentiated independent practice and an engaging hands-on Common Denominator Capture game.

Formats: PowerPoint, PDF and Excel

Aligned to Australian Curriculum: Solve problems involving addition and subtraction of fractions using knowledge of equivalent fractions (AC9M6N05)

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