Teaching Subtraction by Trading – A Maths Lesson Plan for Years 2/3/4

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Summary:

In this maths lesson plan, students learn to rename/trade when subtracting. There are 2 really good Youtube videos that assist teachers in guiding their instruction, followed up with some differentiated practice.

Australian Curriculum Links:

Year 3 Mathematics:
  • Recall addition facts for single-digit numbers and related subtraction facts to develop increasingly efficient mental strategies for computation (ACMNA055)

Maths Lesson Plan:

Orientation  5 minutes

  • Focus: Students’ attention to board
  • Engage: Play subtraction song http://www.youtube.com/watch?v=BvsEbrWV00E
  • Access: “Why is important to learn mental strategies to solve problems?” “What are mental strategies?”

Guided Discovery 15 mins

  • Have the class sitting in a circle on the floor. Solve an algorithm using MAB blocks and the trading system. Ask questions to guide the class, such as ‘what do I do next?”
  • Do the same algorithm on paper to enhance students’ understanding.  

Exploration 20 mins

  • Give students problems to solve students may use MAB blocks to help them solve the problems or simply use pencil and paper.

Individualising

  • Support: Students having difficulty may use MAB blocks and teacher assistance will be provided.
  • Extend: Provide complex problems, such as subtraction with four digit numbers and subtraction across zeros.

Reflection  5 minutes

  • Share/Explain/Justify: Share and explain answers
  • Consolidate: Revise any confusion    
  • Reflect: Who found using MAB blocks was more helpful? Why/why not?
  • Challenge/Extend: Who thinks they can now go on to more challenging problems?

Assessment:

  • Observational checklists
  • Anecdotal notes

Resources:

 

[wpfp-link]

 

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