Lesson 2 Text ‘n’ talk
Lesson plan
| Piagetian Level | Learners Thinking and Abstract of the Activity | ||
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| 3 B Mature Formal |
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? |
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| 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?  |
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| 3A Early Formal |
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. | ||
| 2B* Concrete Generalisation |
'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 |
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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? |
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| 2B Mature concrete |
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| Mid concrete |
Episode 1 Texting |
Episode 2 Phone calls instead of texting |
Episode 3 General use of algebraic language |