Addition and Subtraction: A lesson in Trading/Renaming

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Summary:

In this maths lesson plan, students use games on Studyladder, MAB and decks of cards to reinforce trading/renaming when adding and subtracting numbers.

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)

Lesson:

Orientation 5 minutes

  • Focus: Students attention to activities set out at front.
  • Engage: Tell students today they will be doing hands-on maths.
  • Access: Show students MAB blocks to help revise yesterday’s lesson.

Guided Discovery

  • Revise subtractions using the game:

https://www.studyladder.com.au/resources/activity-fullscreen/4177

  • Explain and guide students through exploration activity

Exploration

At each table students construct two, four digit numbers using a deck of cards and subtract these

Individualising

  • Support: Assist students having difficulties. Students may construct 3 digit numbers instead if 4 digit numbers.
  • Extend: Students construct larger numbers to subtract.

Guided Discovery

  • Revise addition using the game

https://www.studyladder.com.au/resources/activity-fullscreen/3923

  •  Explain and guide students through exploration activity

Exploration

  • At each table students construct two, four digit numbers using a 9 sided die and add these.

Individualising

  • Support: Assist students having difficulties. Students may construct 3 digit numbers instead if 4 digit numbers.
  • Extend: Students construct larger numbers to add.

Reflection  5 minutes

  • Share/Explain/Justify: Do you think this is a good way of practising subtractions by making up your own problem? Why/why not?
  • Consolidate: Misconceptions?
  • Reflect: Who is feeling confident about subtraction using the trading system? Why/why not?
  • Challenge/Extend:  Create a larger digit number subtraction and ask students who thinks they can solve it?

Assessment:

  • Observation, questioning and product analysis

Resources:

  • Games Link https://www.studyladder.com.au
    • Enter keyword: 4 digit addition and search
    • Seventh heading- Mathematics > Number and place Value – Addition of large Numbers –Addition of four digit Numbers
    • Enter keyword: 4 digit subtraction and search
    • Ninth heading- Mathematics > Number and place Value – Subtracting large Numbers –Subtraction of four digit Numbers
  • Decks of cards
  • 9 Sided dice
  • Computers/Interactive Whiteboard
  • Concrete resources (MAB) for kids to model with

 

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Feature image sourced from: http://www.learn-with-math-games.com/addition-regrouping.html

 

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