Addition and Subtraction: A lesson in Trading/Renaming

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