Lesson 2 Text ‘n’ talk

Lesson plan

Piagetian Level Learners Thinking and Abstract of the Activity  
3 B
There are k people on a bus. After the next stop the number is doubled. At the stop after that 3 people get on.

How many people are on the bus now?
A square has a side length of f cm.
A smaller square has a side length of g cm.

The small square was cut out from the larger one. What is the area that remained?
Compare and contrast different methods 'Half n x (n-2)' gives the answer, but the diagrams help in seeing what the formula does' Use of algebra as a language
Expression in terms of generalised number
'n x n - n, or n x (n-1)'

'the diagram is better because it will work for any number of people'
Jars of marmalade weight z grams each. How much do 6 jars weigh? The jars are placed in a box which weighs 300 grams. Write an expression for the box with the jars.
'if i get all the names then I know I've counted them all'

Tom to Jean
Tom to Hassan
Hassan to Jean
Hassan to Tom
Jean to Tom
Jean to Hassan

Jed had saved £x and then he won £y in a competition. He spent £4 on a book about animals, How much has he now?

A tree was t cm tall last year. Since then it has grown another 12 cm. Write an expression for how tall it is now.

One day the tree in our street was x metres high. The next day it was x — 2 metres high. What could have happened?

There are x people in a room and 3 walk out. How many people are left in the room?
Episode 1

Episode 2
Phone calls instead of texting

Episode 3
General use of algebraic language


Thinking Mathematics Lessons Copyright © by Michael Shayer and Mundher Adhami. All Rights Reserved.

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